# Measuring Angles. To find and compare the measures of angles

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1 hsmgmse_4_t easuring ngles ommon ore State Standards G-.. now precise definitions of angle, circle, perpendicular line, parallel line, and line segment... P, P 3, P 6 bjective To find and compare the measures of angles Which angles below, if any, are the same size as the angle at the right? escribe two ways you can verify your answer. How can you use tools like a protractor, ruler, or tracing paper to help you solve this? G THTI PRTIS In this lesson, you will learn to describe and measure angles like the ones in the Solve It. esson Vocabulary angle sides of an angle vertex of an angle measure of an angle acute angle right angle obtuse angle straight angle congruent angles ssential Understanding You can use number operations to find and compare the measures of angles. ey oncept ngle efinition n angle is formed by two rays with the same endpoint. The rays are the sides of the angle. The endpoint is the vertex of the angle. How to Name It You can name an angle by its vertex, a point on each ray and the vertex, or a number, iagram The sides of the angle are > and >. The vertex is. hsmgmse_4_t82 When you name angles using three points, the vertex must go in the middle. The interior of an angle is the region containing all of the points between the two sides of the angle. The exterior of an angle is the region containing all of the points outside of the angle. exterior interior esson -4 easuring ngles 27

2 What rays form j? > and > form. Problem Naming ngles What are two other names for j? and are also names for. 2. a. What are two other names for? b. Reasoning Would it be correct to name any of the angles? xplain. ne way to measure the size of an angle is in degrees. To indicate the measure of an angle, write a lowercase m in front of the angle symbol. In the diagram, the measure of is 62. You write this as m = 62. In this book, you will work only with degree measures. circle has 36, so degree is 36 of a circle. protractor forms half a circle and measures angles from to Postulate -7 Protractor Postulate onsider > and a point on one side of >. very ray of the form > can be paired one to one with a real number from to inches The Protractor Postulate allows you to find the measure of an angle. onsider the diagram below. The measure of is the absolute value of the difference of the real numbers paired with > and >. That is, if > corresponds with c, and > corresponds with d, then m = c - d c d inches Notice that the Protractor Postulate and the calculation of an angle measure are very similar to the Ruler Postulate and the calculation of a segment length. 28 hapter Tools of Geometry

3 7 You can classify angles according to their measures. ey oncept Types of ngles acute angle right angle obtuse angle straight angle The symbol in the diagram above indicates a right angle. Problem 2 easuring and lassifying ngles What are the measures of jn, j, and jn? lassify each angle as acute, right, obtuse, or straight H inches N o the classifications make sense? Yes. In each case, the classification agrees with what you see in the diagram. Use the definition of the measure of an angle to calculate each measure. m N = 45 - = 45; N is obtuse. m = 9-45 = -55 = 55; is acute. m N = 9 - = 9; N is right. 2. What are the measures of H, HN, and H? lassify each angle as acute, right, obtuse, or straight. ngles with the same measure are congruent angles. This means that if m = m, then. You can also say that if, then m = m. You can mark angles with arcs to show that they are congruent. If there is more than one set of congruent angles, each set is marked with the same number of arcs. m m esson -4 easuring ngles 29

4 Problem 3 Using ongruent ngles ook at the diagram. What do the angle marks tell you? The angle marks tell you which angles are congruent. Sports Synchronized swimmers form angles with their bodies, as shown in the photo. If mjgh = 9, what is mj? GH because they both have two arcs. So, m GH = m = Use the photo in Problem 3. If m = 49, what is m? G H The ngle ddition Postulate is similar to the Segment ddition Postulate. Postulate -8 ngle ddition Postulate If point is in the interior of, then m + m = m. How can you use the expressions in the diagram? The algebraic expressions represent the measures of the smaller angles, so they add up to the measure of the larger angle. Problem 4 Using the ngle ddition Postulate lgebra If mjrqt = 55, what are mjrqs and mjtqs? m RQS + m TQS = m RQT ngle ddition Postulate 4x x + 42 = 55 Substitute. 7x - 6 = 55 ombine like terms. 7x = 6 dd 6 to each side. x = 23 ivide each side by 7. S (3 4) (4 2) T R Q m RQS = 4x - 2 = = 92-2 = 72 m TQS = 3x + 4 = = = 83 Substitute 23 for x. 4. is a straight angle. What are m and m? ( 2) (2 ) hapter Tools of Geometry

5 esson heck o you know HW? Use the diagram for xercises 3.. What are two other names for? 2. lgebra If m = 85, what is an expression to represent m? 3. lassify. o you UNRSTN? 4. Vocabulary How many sides can two congruent angles share? xplain. 5. rror nalysis Your classmate concludes from the diagram below that. Is your classmate correct? xplain. THTI PRTIS Practice and Problem-Solving xercises THTI PRTIS Practice Name each shaded angle in three different ways. See Problem X 2 Y Z Use the diagram below. ind the measure of each angle. Then classify the angle as acute, right, obtuse, or straight raw a figure that fits each description. 5. an obtuse angle, RST 6. an acute angle, GH 7. a straight angle, inches See Problem Use the diagram below. omplete each statement. See Problem H 2. If m = 75, then m =. 2. If m GH =, then m =. H G esson -4 easuring ngles 3

6 22. If m = 79, what are 23. RQT is a straight angle. m and m? What are m RQS and m TQS? See Problem 4. (5 4) (8 3) (6 2) T Q S (2 4) R pply Use a protractor. easure and classify each angle Think bout a Plan pair of earrings has blue wedges that are all the same size. ne earring has a 25 yellow wedge. The other has a 4 yellow wedge. ind the angle measure of a blue wedge. How do the angle measures of the earrings relate? How can you use algebra to solve the problem? 25 4 lgebra Use the diagram at the right for xercises 29 and. Solve for x. ind the angle measures to check your work. 29. m = 4x - 2, m = 5x +, m = 2x + 4. m = 28, m = 3x - 2, m = 6x 3. If m QV = 9, which expression can you use to find m VQP? Q V P m QP - 9 m QP m QV 9 + m VQP N 32. iterature ccording to legend, ing rthur and his knights sat around the Round Table to discuss matters of the kingdom. The photo shows a round table on display at Winchester astle, in ngland. rom the center of the table, each section has the same degree measure. If ing rthur occupied two of these sections, what is the total degree measure of his section? hallenge Time ind the angle measure of the hands of a clock at each time : 34. 7: 35. : 36. 4: : :5 39. pen-nded Sketch a right angle with vertex V. Name it. Then sketch a 35 angle that shares a side with. Name it PV. Is there more than one way to sketch PV? If so, sketch all the different possibilities. (Hint: Two angles are the same if you can rotate or flip one to match the other.) 32 hapter Tools of Geometry

7 4. Technology Your classmate constructs an angle. Then he constructs a ray from the vertex of the angle to a point in the interior of the angle. He measures all the angles formed. Then he moves the interior ray as shown below. What postulate do the two pictures support? PRRN TS pply What You ve earned ook back at the diagram on page 3 for the riddle ameron found in an antique store. hoose from the following words and equations to complete the sentences below. THTI PRTIS P 6 right congruent obtuse 2s + 6 = 48 2s = 9 2s = 8 s = 6 s = 2 s.7 a. In the riddle s diagram, H and H are? angles. b. The equation that correctly relates m H and m H is?. c. The solution of the equation from part (b) is?. esson -4 easuring ngles 33

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