# 4-1 Classifying Triangles. ARCHITECTURE Classify each triangle as acute, equiangular, obtuse, or right. 1. Refer to the figure on page 240.

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1 ARCHITECTURE Classify each triangle as acute, equiangular, obtuse, or right. 1. Refer to the figure on page 240. Classify each triangle as acute, equiangular, obtuse, or right. Explain your reasoning. One angle of the triangle measures 90, so it is a right angle. Since the triangle has a right angle, it is a right triangle. 2. Refer to the figure on page is equiangular, since all three angles are congruent. In,. So, is obtuse. Since the triangle has an obtuse angle, it is obtuse. 6. In the figure,. So by substitution, is a right triangle, since. CCSS PRECISION Classify each triangle as equilateral, isosceles, or scalene. One angle of the triangle measures 120, so it is an obtuse angle. Since the triangle has an obtuse angle, it is an obtuse triangle. 7. The triangle has two congruent sides. So, it is isosceles. 3. Refer to the figure on page No two sides are congruent in the given triangle. So, it is scalene. Since all the angles are congruent, the triangle is equiangular. esolutions Manual - Powered by Cognero Page 1

2 If point K is the midpoint of, classify each triangle in the figure as equilateral, isosceles, or scalene. ALGEBRA Find x and the measures of the unknown sides of each triangle. 9. In, K is the midpoint of. So,. 12. In the figure, So, Solve for x. So, all the sides of Therefore, have equal lengths. is equilateral. Substitute in LN and MN. 10. In, GL = GH + HL by Segment Addition Postulate. has two congruent sides. So, it is isosceles. 11. In, K is the midpoint of. So,. Also, HL = 3 and FL = 7. No two sides are congruent in is scalene.. Therefore, it esolutions Manual - Powered by Cognero Page 2

3 Classify each triangle as acute, equiangular, obtuse, or right. 13. In the figure, So any combination of two side measures can be used to find x. 15. One angle of the triangle measures 115, so it is a obtuse angle. Since the triangle has an obtuse angle, it is an obtuse triangle. Substitute in QR.. Since all the sides are congruent, QR = RS = QS = JEWELRY Suppose you are bending stainless steel wire to make the earring shown. The triangular portion of the earring is an isosceles triangle. If 1.5 centimeters are needed to make the hook portion of the earring, how many earrings can be made from 45 centimeters of wire? Explain your reasoning The triangle has three acute angles that are not all equal. It is an acute triangle. One angle of the triangle measures 90, so it is a right angle. Since the triangle has a right angle, it is a right triangle. 4; The total amount of wire needed, including the hook, is or 10 cm. 45 cm 10 cm/earring = 4.5 earrings. There is not enough wire to make 5 earrings, only 4 can be made from 45 cm of wire Since all the angles are congruent, it is a equiangular triangle. The triangle has three acute angles. It is an acute triangle. esolutions Manual - Powered by Cognero Page 3

4 20. One angle of the triangle measures 90, so it is a right angle. Since the triangle has a right angle, it is a right triangle. CCSS PRECISION Classify each triangle as acute, equiangular, obtuse, or right. 24. All the angles are acute angles in. So, it is acute triangle. 25. In,. So, is a right angle. Since the triangle has a right angle, it is a right triangle. 26. All the angles are congruent in equiangular.. So, it is Classify each triangle as equilateral, isosceles, or scalene. 27. Refer to the figure on page In,. So, is obtuse. Since the triangle has an obtuse angle, it is obtuse. 22. In,. So, is a right angle. Since the triangle has a right angle, it is a right triangle. Since all the sides are congruent, the triangle is equilateral. 28. Refer to the figure on page All the angles are acute angles in acute triangle.. So, it is an The triangle has two congruent sides. So, it is isosceles. esolutions Manual - Powered by Cognero Page 4

5 29. Refer to the figure on page No two sides are congruent in scalene.. So, it is No two sides are congruent in the given triangle, so it is scalene. If point C is the midpoint of and point E is the midpoint of, classify each triangle as equilateral, isosceles, or scalene No two sides are congruent in scalene.. So, it is Here, C is the midpoint of. So, BC = CD = 4. Also by Segment Addition Postulate, BC = BC + CD = 8. In, AB = 8, BD = 8, and AD = 8. All the sides are congruent in. So, it is equilateral. 30. In, all the sides are of different lengths. So, it is scalene Here, E is the midpoint of. So, DE = EF = 5. In, all the sides are having different lengths. So, it is scalene. Here, E is the midpoint of. So, DE = EF = 5. Also by the Segment Addition Postulate, DF = DE + EF = 10. In, DF = 10 and AF = 10. The triangle has two congruent sides. So, it is isosceles. esolutions Manual - Powered by Cognero Page 5

6 36. ALGEBRA Find x and the length of each side if is an isosceles triangle with 37. ALGEBRA Find x and the length of each side if is an equilateral triangle. Here, By the definition of congruence,. Since is an equilateral triangle, So any combination of sides can be used to find x. Let's use Solve for x. Substitute in AB, BC, and CA. Substitute in FG. Since all the sides are congruent, FG = GH = HF = GRAPHIC ART Classify each numbered triangle in Kat by its angles and by its sides. Use the corner of a sheet of notebook paper to classify angle measures and a ruler to measure sides. Refer to the figure on page : right scalene; this has 1 right angle and the lengths of each side are different 2: right scalene; this has 1 right angle and the lengths of each side are different 3: obtuse scalene; this has 1 obtuse angle and the lengths of each side are different 4: acute scalene; all angles are less than 90 and the lengths of each side are different 5: right scalene; this has 1 right angle and the lengths of each side are different 6: obtuse scalene; this has 1 obtuse angle and the lengths of each side are different esolutions Manual - Powered by Cognero Page 6

7 39. KALEIDOSCOPE Josh is building a kaleidoscope using PVC pipe, cardboard, bits of colored paper, and a 12-inch square mirror tile. The mirror tile is to be cut into strips and arranged to form an open prism with a base like that of an equilateral triangle. Make a sketch of the prism, giving its dimensions. Explain your reasoning. Because the base of the prism formed is an equilateral triangle, the mirror tile must be cut into three strips of congruent width. Since the original tile is a 12-inch square, each strip will be 12 inches long by 12 3 or 4 inches wide. COORDINATE GEOMETRY Find the measures of the sides of and classify each triangle by its sides. 43. X( 5, 9), Y(2, 1), Z( 8, 3) Graph the points on a coordinate plane. Use the Distance Formula to find the lengths of. CCSS PRECISION Classify each triangle in the figure by its angles and sides. has endpoints X( 5, 9) and Y(2, 1) has two congruent sides and a right angle. So, it is an isosceles right triangle. In the figure,. has endpoints Y(2, 1) and Z( 8, 3). has two congruent sides and an obtuse angle. So, it is an isosceles obtuse triangle. 42. No two sides are congruent in and it has a right angle. So, it is a scalene right triangle. has endpoints X( 5, 9) and Z( 8, 3). esolutions Manual - Powered by Cognero Page 7

8 No two sides are congruent. So, it is scalene. 44. X(7, 6), Y(5, 1), Z(9, 1) Graph the points on a coordinate plane. XY = XZ. This triangle has two congruent sides. So, it is isosceles. Use the Distance Formula to find the lengths of. has end points X(7, 6) and Y(5, 1). has endpoints Y(5, 1) and Z(9, 1). has endpoints X(7, 6) and Z(9, 1). esolutions Manual - Powered by Cognero Page 8

9 45. X(3, 2), Y(1, 4), Z(3, 4) Graph the points on a coordinate plane. 46. X( 4, 2), Y( 3, 7), Z(4, 2) Plot the points on a coordinate plane. Use the Distance Formula to find the lengths of. has end points X(3, 2) and Y(1, 4). Use the Distance Formula to find the lengths of. has endpoints X( 4, 2) and Y( 3, 7). has endpoints Y(1, 4) and Z(3, 4). has endpoints Y( 3, 7) and Z(4, 2). has endpoints X(3, 2) and Z(3, 4). has endpoints X( 4, 2) and Z(4, 2). YZ = XZ = 2. This triangle has two congruent sides. So, it is isosceles. esolutions Manual - Powered by Cognero Page 9

10 48. PROOF Write a two-column proof to prove that is equiangular if is equiangular and No two sides are congruent. So, it is scalene. 47. PROOF Write a paragraph proof to prove that is an acute triangle if and is acute. Given: Prove: is acute. Proof: and form a linear pair. and are supplementary because if two angles form a linear pair, then they are supplementary. So,. We know, so by substitution,. Subtract to find that. We already know that is acute because is acute. must also be acute because is acute and definition.. is acute by Given: is equiangular and Prove: is equiangular. Proof: Statements (Reasons) 1. is equiangular and (Given) 2. (Def. of equiangular ) 3. and (Corr. Post.) 4. (Substitution) 5. is equiangular. (Def. of equiangular ) ALGEBRA For each triangle, find x and the measure of each side. 49. is an equilateral triangle with FG = 3x 10, GH = 2x + 5, and HF = x Since is equilateral, FG = GH = HF. Consider FG = GH. 3x 10 = 2x + 5 3x 10 2x = 2x + 5 2x x 10 = 5 x =15 Substitute x =15. Since all the sides are congruent, FG = GH = HF = 35. esolutions Manual - Powered by Cognero Page 10

11 50. is isosceles with, JK = 4x 1, KL = 2x + 5, and LJ = 2x 1. Here,. By the definition of congruence,. 51. is isosceles with. MN is two less than five times x, NP is seven more than two times x, and PM is two more than three times x. Here,. By the definition of congruence,. MN = 5x 2, NP = 2x + 7, PM = 3x + 2 Substitute in JK, KL, and LJ. Substitute in MN, NP, and PM. esolutions Manual - Powered by Cognero Page 11

12 52. is equilateral. RS is three more than four times x, ST is seven more than two times x, and TR is one more than five times x. Since is equilateral, RS = ST = TR. RS = 4x + 3, ST = 2x + 7, TR = 5x STOCKS Technical analysts use charts to identify patterns that can suggest future activity in stock prices. Symmetrical triangle charts are most useful when the fluctuation in the price of a stock is decreasing over time. a. Classify by its sides and angles the triangle formed if a vertical line is drawn at any point on the graph. b. How would the price have to fluctuate in order for the data to form an obtuse triangle? Draw an example to support your reasoning. Substitute x =2. Since all the sides are congruent, RS = ST = TR = CONSTRUCTION Construct an equilateral triangle. Verify your construction using measurement and justify it using mathematics. (Hint: Use the construction for copying a segment.) a. The two lines represent the highs and lows of a stock converging on the same price. Since the triangle is symmetrical, the top side would be a reflection of the bottom side. So, the two segments are congruent and the triangle is isosceles.the base angles of an isosceles triangle would be congruent acute angles and the angle formed by the converging prices is acute. Therefore, the triangle is acute. b. Sample answer: The fluctuation (the difference between the high and low prices of the stock) would have to be high and decrease quickly (over a short period of time) in order to form an obtuse triangle. A greater fluctuation will stretch out the angle, making its measure increase. Sample answer: In AB = BC = AC = 1.3 cm. Since all sides have the same length, they are all congruent. Therefore the triangle is equilateral. was constructed using AB as the length of each side. Since the arc for each segment is the same, the triangle is equilateral. 55. MULTIPLE REPRESENTATIONS In the diagram, the vertex opposite side is a. GEOMETRIC Draw four isosceles triangles, esolutions Manual - Powered by Cognero Page 12

13 including one acute, one right, and one obtuse isosceles triangle. Label the vertices opposite the congruent sides as A and C. Label the remaining vertex B. Then measure the angles of each triangle and label each angle with its measure. b. TABULAR Measure all the angles of each triangle. Organize the measures for each triangle into a table. Include a column in your table to record the sum of these measures. c. VERBAL Make a conjecture about the measures of the angles that are opposite the congruent sides of an isosceles triangle. Then make a conjecture about the sum of the measures of the angles of an isosceles triangle. d. ALGEBRAIC If x is the measure of one of the angles opposite one of the congruent sides in an isosceles triangle, write expressions for the measures of each of the other two angles in the triangle. Explain. b. a. Sample answer: c. Sample answer: In an isosceles triangle, the angles opposite the congruent sides have the same measure. The sum of the measures of the angles of an isosceles triangle is 180. d. x and 180 2x; If the measures of the angles opposite the congruent sides of an isosceles triangle have the same measure, then if one angle measures x, then the other angle also measures x. The sum of the measures of the angles of an isosceles triangle is 180, thus the measure of the third angle is 180 2x. esolutions Manual - Powered by Cognero Page 13

14 56. ERROR ANALYSIS Elaina says that is obtuse. Ines disagrees, explaining that the triangle has more acute angles than obtuse angles so it must be acute. Is either of them correct? Explain your reasoning. Sample answer: Elaina; all triangles have at least two acute angles, so using Ines reasoning all triangles would be classified as acute. Instead, triangles are classified by their third angle. If the third angle is also acute, then the triangle is acute. If the third angle is obtuse, as in the triangle shown, the triangle is classified as obtuse. CCSS PRECISION Determine whether the statements below are sometimes, always, or never true. Explain your reasoning. 57. Equiangular triangles are also right triangles. Never; all equiangular triangles have three 60 angles, so they do not have a 90 angle. Therefore they cannot be right triangles. 58. Equilateral triangles are isosceles. Always; all equilateral triangles have three equal sides and isosceles triangles have at least two equal sides, so all triangles with three equal sides are isosceles. 59. Right triangles are equilateral. Never; all equilateral triangles are also equiangular, which means all of the angles are 60. A right triangle has one 90 angle. 60. CHALLENGE An equilateral triangle has sides that measure 5x + 3 units and 7x 5 units. What is the perimeter of the triangle? Explain. Sample answer: Since the triangle is equilateral, the sides are equal. Setting 5x + 3 equal to 7x 5 and solving, x is 4. The length of one side is 5(4) + 3 or 23 units. The perimeter of an equilateral triangle is the sum of the three sides or three times one side. The perimeter is 3(23) or 69 units. OPEN ENDED Draw an example of each type of triangle below using a protractor and a ruler. Label the sides and angles of each triangle with their measures. If not possible, explain why not. 61. scalene right Sample answer: 62. isosceles obtuse Sample answer: 63. equilateral obtuse Not possible; all equilateral triangles have three acute angles. esolutions Manual - Powered by Cognero Page 14

15 64. WRITING IN MATH Explain why classifying an equiangular triangle as an acute equiangular triangle is unnecessary. Sample answer: An acute triangle has three acute angles and an equiangular triangle has three angles that measure 60. Since an angle that measures 60 is an acute angle, all equiangular triangles are acute. Therefore, acute equiangular is redundant. 65. Which type of triangle can serve as a counterexample to the conjecture below? A equilateral B obtuse C right D scalene An acute angle is less than 90. In an equilateral triangle, all 3 angles are acute. Therefore, an equilateral triangle is a counterexample to the given statement. The correct answer is A. 66. ALGEBRA A baseball glove originally cost \$ Kenji bought it at 40% off. How much was deducted from the original price? F \$50.70 G \$44.50 H \$33.80 J \$32.62 We need to find 40% of in order to calculate the discount. 67. GRIDDED RESPONSE Jorge is training for a 20- mile race. Jorge runs 7 miles on Monday, Tuesday, and Friday, and 12 miles on Wednesday and Saturday. After 6 weeks of training, Jorge will have run the equivalent of how many races? Jorge runs 7 miles on Monday, Tuesday, and Friday, and 12 miles on Wednesday and Saturday. Total miles per week = = 45 miles He will run 45 times 6 or 270 miles in 6 weeks. Number of races = 270/20 = SAT/ACT What is the slope of the line determined by the equation 2x + y = 5? A 69. B 2 C 1 D 2 E Write the equation 2x + y = 5 in slope-intercept form. y = 2x + 5 Here, slope is 2. So, the correct option is B. Find the distance between each pair of parallel lines with the given equations. The two lines are of the form x = a. So, the slopes are undefined. Therefore, the lines are vertical lines passing through x = 2 and x = 5 respectively. The perpendicular distance between the two vertical lines is 5 ( 2) = 7 units. So, \$33.80 was deducted from the original price. The correct option is H. 70. The two lines have the coefficient of x, zero. So, the slopes are zero. Therefore, the lines are horizontal lines passing through y = 6 and y = 1 respectively. The perpendicular distance between the two horizontal lines is 1 ( 6) = 7 units. esolutions Manual - Powered by Cognero Page 15

16 The slope of a line perpendicular to both the lines will be. Consider the y-intercept of any of the two lines and write the equation of the perpendicular line through it. The y-intercept of the line y = 2x 7 is (0, 7). So, the equation of a line with slope and a y-intercept of 7 is. The perpendicular meets the line y = 2x 7 at (0, 7). To find the point of intersection of the perpendicular and the other line, solve the two equations. The left sides of the equations are the same. So, equate the right sides and solve for x. The slope of a line perpendicular to both the lines will be 1. Consider the y-intercept of any of the two lines and write the equation of the perpendicular line through it. The y-intercept of the line y = x 4 is (0, 4). So, the equation of a line with slope 1 and a y- intercept of 4 is. The perpendicular meets the line y = x 4 at (0, 4). To find the point of intersection of the perpendicular and the other line, solve the two equations. The left sides of the equations are the same. So, equate the right sides and solve for x. Use the value of x to find the value of y. Use the value of x to find the value of y. So, the point of intersection is ( 3, 1). Use the Distance Formula to find the distance between the points ( 3, 1) and (0, 4). So, the point of intersection is ( 4, 5). Use the Distance Formula to find the distance between the points ( 4, 5) and (0, 7). Therefore, the distance between the two lines is Therefore, the distance between the two lines is 73. FOOTBALL When striping the practice football field, Mr. Hawkins first painted the sidelines. Next he marked off 10-yard increments on one sideline. He then constructed lines perpendicular to the sidelines at each 10-yard mark. Why does this guarantee that the 10-yard lines will be parallel? The lines at each 10-yard mark are perpendicular to the sideline. Since two lines perpendicular to the same line are parallel, Mr. Hawkins can be certain that the 10-yard lines are parallel. esolutions Manual - Powered by Cognero Page 16

17 Identify the hypothesis and conclusion of each conditional statement. 74. If three points lie on a line, then they are collinear. H: three points lie on a line; C: the points are collinear 75. If you are a teenager, then you are at least 13 years old. H: you are a teenager; C: you are at least 13 years old 76. If 2x + 6 = 10, then x = 2. H: 2x + 6 = 10; C: x = If you have a driver s license, then you are at least 16 years old. H: you have a driver s license; C: you are at least 16 years old Refer to the figure. 81. Are points D, E, C, and B coplanar? Points D, C, and B lie in plane N, but point E does not lie in plane N. Thus, they are not coplanar. Identify each pair of angles as alternate interior, alternate exterior, corresponding, or consecutive interior angles. Alternate interior angles Consecutive interior angles Alternate interior angles 78. How many planes appear in this figure? The planes in the figure are: Plane AEB, plane BEC, plane CED, plane AED, and plane N. So, there are 5 planes appear in this figure. 85. Alternate exterior angles 79. Name the intersection of plane AEB with plane N. Plane AEB intersects with plane N in 80. Name three points that are collinear. Points E, F, and C lie in the same line. Thus they are collinear. esolutions Manual - Powered by Cognero Page 17

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