MDPT - Geometry Practice Problems. 1. ABC is an isosceles triangle with base BC. L1 and L2 are parallel. 1=80. Find 4.
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1 MDPT - Geometry Practice Problems 1. C is an isosceles triangle with base C. L1 and L are parallel. 1=80. Find 4. L1 1 4 a. 80 b. 50 c. 45 d. 60. In the figure, the measure of arc C is 7 π / 4 and O is the center. of the circle. Find 1. a. 30 b. 50 c. 40 d Find the area of an equilateral triangle with a sides of length 1. a. 7 b. 7 c d Find the area of a circle inscribed in a square with sides of length 8 cm. a. 4π cm b. π cm c. 16π cm d. 8π cm 3 C O 1 C L 5. In the figure, 1=40. Find rc. a. 60 b. 40 c. 0 d Find the length of one of the equal sides of an isosceles triangle with a perimeter 105 if the base is one-third the length of one of the equal sides. a. 45 b. 15 c. 35 d n 8 ft by 10 ft garden is surrounded by a ft walkway. Find the area of thewalkway? a. 160 ft b. 8 ft c. 158 ft d. 88 ft
2 8. In the figure, =1, DE=9, and E=4. Find EC. a. 1 b. 16 D c. 13 d. 1 C E 9. Find the volume of a tent with length 9 ft, height 7 ft, and a 6 foot base. a. 567 ft 3 b. 189 ft 3 c ft 3 d. 16 ft The circle in the figure has a circumference of 10π inches. What is the area of the square circumscribed about the circle? a. 5 in b. 50 in c. 100 in d. 5π in 11. For the right triangle in the figure, find x. a. 5 b. 5 c. 3 d In the figure L1 and L are parellel. Find x. x 1 a. 18 b. 10 c. 9 d. 0 4x L1 5x L 13. π/3 radians is how many degrees? a. 60 b. 90 c. 10 d In the figure, C is a diagonal of rectangle CD. EF is perpendicular to and DC=35. Find EF. a. 35 b. 45 c. 55 d. 65 C E F D
3 15. The object in the figure has a square base with sides of length 4 and a semicircular top. Find the perimeter of the object. a. 16+π b. 1+π c. 16+4π d For the parallelogram in the figure =50. Find. a. 180 b. 50 c. 130 d Express 45 in radians. a. π/8 b. π/4 c. π/ d. π 18. In the figure, parallelgram CD has an area of 48. If C = 5 and E = 4, what is the perimeter of parallelogram CD? a. 6 b. 3 D E c. 34 d. 36 C 19. The volume of a right cylinder is 300 in 3. If the radius is doubled, what will the new volume be? a. 900 in 3 b. 400 in 3 c. 600 in 3 d. 100 in 3 0. Find the area of trapezoid CD in the figure below. C F E 45 D a. 90 b c d. 84
4 1. Find the volume of the tank in the diagram below. where the domes are hemispheres with diameter 6 inches. a. 63π in 3 b. 396π in 3 c. 360π in 3 d. 1544π in 3 3 ft.. Find the arclength of arc if O is the center, the measure of arc C is 300, and the radius of the circle is 10. a. 60 b. 60π c. 10π/3 d. 50π/3 C O 3. If C and abc are similar triangles with C=0, C=16, bc=1, =70, and c=60, find and ac. a. =50, ac=10 b. =60, ac=16 c. =70, ac=18 d. =50, ac=15 4. What is the volume of material left if a hole with a radius of 1 is drilled through a solid cube with sides of 4? (see drawing) a π b. 1-16π c. 16-4π d. 64-4π 5. In the figure below, the length of arc is π inches, the radius of the circle is 3 inches, and O is the center. Find the measure of 1. a. 30 b. 0 c. 40 d. 60 O 1
5 6. Find the distance between the points (8,7) and (3,-5). a. 5 b. 13 c. 13 d Find the midpoint between the points (3,-5) and (8,7). a. 5,6 b. 11,6 c. 11,1 d. 5,1
6 nswers 1. b. d 3. c 4. c 5. d 6. a 7. d 8. a 9. b 10. c 11. c 1. d 13. c 14. c 15. b 16. c 17. b 18. c 19. d 0. c 1. c. c 3. d 4. d 5. a 6. c 7. c Solutions = = = 100 C isosceles, so = 3, therefore = 50 Since L1 and L are parellel, = 4 4 = 50. arc C = π - 7π/4 = π/4 = 180 /4 = 45 Since 1 is a central angle, 1 = arc C 1 = n altitude from a vertex to an opposite side bisects the side. Use the Pythagorean formula to find the height h + 6 = 1 h = 6 3 rea = 1 ( base) ( height) = 1 ( 1) 6 3 ( ) = d = side of the square = 8 cm, but d is also the diameter of the circle r = (1/) d = 4 cm, where r is the radius of the circle rea of the circle = π r = π (4 cm) = 16π cm 5. 1 is an inscribed angle. rc length = twice the measure of the inscribed angle. rc = 1; rc = (40 ) = If the base = x then the equal sides = 3x Perimeter = = x + 3x + 3x = 7x x = 15, so equal sides = (3)(15) = rea of garden = (8 ft)(10 ft) = 80 ft The garden + walkway together have width 8 ft + ft + ft = 1 ft The garden + walkway together have length 10 ft + ft + ft = 14 ft rea of garden + walkway together = (1 ft)(14 ft) = 168 ft rea of walkway = 168 ft 80 ft = 88 ft
7 8. C and DEC are similar, so the ratios of corresponding sides are equal DE = C EC Let CE = x, then 1 9 = 4 + x x Cross multiply and solve for x: x = 1 9. Volume = (area of base) (height) The base is a triangle with base 6 ft and height 7 ft rea of base = (1/)(7 ft)(6 ft) = 1 ft Volume = (1 ft )(9 ft) = 189 ft Circumference = πd, where d is the diameter 10π in = π d d = 10 in, this is also the length of the side of the square rea of a square = side = (10 in) = 100 in 11. For right trangles a + b = c, where c is the hypotenuse x + 1 = x = 4-1 x = 3 1. L 1 and L are parellel so the angles are supplemental. 4x + 5x = 180 x = Use the fact that π radians equals 180 : (180 )/3 = C and D are parellel so DC = EF DC = 35 so EF = 35 EF = = Perimeter of base = = 1 Perimeter of Semicircle: C = (1/) π d d = 4 because of the base. C = (1/) π 4 = π Total perimeter = 1 + π
8 16. djacent andles in a parallelogram are supplemental + = = 180 = Use the fact that 180 equals π radians: 180 /π = 45 /x x = 45 π/180 x = π/4 18. rea parallelogram = (base) (height) 48 = 4(base) 1= base Perimeter = = V = π r h, where v is volume of a right cylinder, r is radius, and h is the height. When r is doubled, r is replaced by (r) = 4r This increases the original volume by 4 (300 in 3 ) (4) = 100 in 3 0. CDE is a so ED = 6 = 6 CE = ED, so CE = 6 F is a so F = 4 3 = 3 rea = (1/) (CE) (C + D) rea = (1/) (6) ( ) = V tank = V domes + V cylinder, but two domes = sphere, so V tank = V sphere + V cylinder V tank = 4 3 πr 3 + πr h where r is 3 inches and h is 36 inches V tank = 4 3 π 33 + π = 360π
9 . arc measure = arc measure C = = 60 O = 60, central angle equals the measure of the intercepted arc arclen = O 60 πr = π 10 = 10 3 π 3. Since the triangles are similar, all corresponding angles are equal and corresponding sides are proportional. So, C = c = 60 = C = = 50 C ac = C bc 0 ac = 16 ac = V = V cube - V cylinder V = side 3 - π r h = π 1 x 4 = 64-4π 5. arclen = O O πr π = π 3, solve for O O = 360 / 6 = 60 1 = (1/) O = (1/) 60 = 30
10 6. d = ( x 1 x ) + (y 1 y ) distance formula d = (8 3) + (7 ( 5)) d = 5 +1 d = d = 169 d = x 1 + x, y 1 + y 3 + 8, , 11,1 midpoint formula
11 lgebra Practice Problems for ELM and MDPT Math nalysis 1. Multiply and simplify: (-4x ) (5x 5 ). Simplify: a. 0x 10 b. x 7 c. 0x 7 d. 9x 10 a. 1 x 1 y 1 4 x 4 3 y 1 x Simplify 3 18a 4 c 6 1 b. x c. xy -1/4 d. x 1 6 a. 4ac a b. 4ac c. 6ac 3 d. 4ac 3 a y Simplify: 5 18x 3 8x + x a. 3 x + x b. 3 x + x c. 9 x + x d. 9 x + x 5. Simplify: 1 x 3 8 x a. 0 x 5 16 b. x c. x d. x Solve: 4a 7 = a + 4 a b. -1 c. 3 5 d Solve: x x 1 10 = 5 a. 5 b c. 13 d Solve: 1.30P (0 P) = 8 a b. 40 c d If f(x) = x - x + 4, find: f(-3) a. -8 b. 10 c. - d. 16
12 10. If f(x) = 4x - 3, find f(r+1) a. 4r + 1 b. r - c. 4r - 3 d. r Evaluate f(x) = 16x 8 for x = a. 1 b. 1 c. 4 d. 1. Find the domain of the function f (x) = x 3 x 1 a. all x except x = 3 b. all x except x = 0 c. all x except x = - d. all x except x = 1/ 13. The cost C in dollars to produce x items is given by C = x. How many items can be produced for 400 dollars? a. 150 b. 600 c. 300 d Solve: 5( x + 3) = 3( x + 3) + 6 a. 0 b. c. 15 d The height of the Empire State uilding and its antenna is 147 feet. The difference in height between the building and the antenna is 108 feet. How tall is the antenna? a. 444 ft. b. 150 ft. c. 111 ft. d. ft. 16. Solve the system: 5 6 x + y 4 = 7 and 3 x y 8 = 3 a. x = -6, y = 48 b. x = 6, y = 8 c. x = 1, y = -1 d. x = 5 13, y = Find the equation of a line passing through the point (, -4) and having a slope of 3. a. y = 3x + 10 b. y = 3x + 4 c. y = 3x - 6 d. y = 3x - 10
13 18. Find the equation of the line passing through the point (1, -) and perpendicular to the line y - x = 1 a. y = 1 x 6 b. y = -x + 4 c. y = x + d. y = 1 x Find the equation of the line passing through the points (,4) and (-7,3) a. y = 1 9 x + 34 b. y = -9x 16 9 c. y = -9x + 14 d. y = 1 9 x plane flies 600 miles with the wind for hours. The return trip against the wind takes 3 hours. Find the speed of the wind. a. 50 mph b. 5 mph c. 50 mph d. 5 mph 1. Solve: 3x < ( x ) a. x < b. x > c. x < - d. x > -. Solve: x 4 = 8 a. or -6 b. 6 or - c. 6 d Solve: 4x a. x -1 or x b. 1 x c. x 3 d. x - or x 1 4. Subtract: (10x 3 + 8x 7x 3) - (4x 3 - x + x -7) a. 6x x 8x + 4 b. 6x 3 + 6x 6x - 10 c. 6x 3 6x 8x - 10 d. 6x x 6x Multiply: (3x - ) (5x + 1) a. 8x - 4x - b. 15x + 13x + c. 15x - 7x - d. 8x + 13x +
14 6. Factor: 81x - y a. (81x + y)(x y) b. (9x y)(9x - y) c. (x - y) (81x y) d. (9x + y)(9x - y) 7. Factor: 3y - 7y + a. (3y ) (y + 1) b. ( 3y - 1) ( y - ) c. (3y 1) (y + ) d. (3y + 1) (y - ) 8. Simplify the fraction: x + 4x 5 x 1 a. x + 5 b. x + 4 c. x - 4 d. x Simplify the fraction: 4x 8x + 6 4x a. x x + 6 x c. x + 3 x 30. Divide and simplify: a. 1 x + 1 b. 31. Solve the given equation: b. 4x + 4 d. -7x+6 x x x + 4x + 3 x x 15 x + 1 c. ( x 5) 1 x + 5 x x + = 7 x d. x + 1 x 5 a. 1 b. 13 c. -11 d Find the roots of f(x) = x - 5x + 6 a. 0 and 6 b. -1 and 6 c. and 3 d. -5 and Solve for x: log 8 = x a. 1 b. c. 3 d Write 4log b x + log b y - 3log b z as one log a. log(4x + y - 3z) b. log(x 4 + y - z 3 ) c. log(4xy) / 3z d. log(x 4 y) / z 3
15 35. Solve for x: log 4 x + log 4 (x - 6) = a. 8 b. 6 c. 0 or 6 d. - or Simplify ( 3 + ) a b. 7 c d Solve: 3[(x - 5) - (4x - 7)] = (4 + 5)(x + 1) a. 1/9b. -3 c. -1/3 d Find the roots for (x + 1)(x - ) = 10 a. -1 and b. - and 4 c. -3 and 4 d. -1 and Multiply and simplify: (-4 + i)(5-3i) a. -14+i b. -10+I-6i c.-0+16i d. -0-6i 40. Simplify: 8 4 a. i b. 1 c. + d. nswers 1. c. a 3. d 4. d 5. b 6. a 7. d 8. b 9. d 10. a 11. c 1. d 13. b 14. a 15. d 16. b 17. d 18. d 19. a 0. c 1. c. b 3. d 4. a 5. c 6. d 7. b 8. a 9. c 30. a 31. c 3. c 33. c 34. d 35. a 36. c 37. a 38. c 39. a 40. a
16 1. (-4)(5)x +5 = -0x 7 Solutions. x y = xy 1 = x y 1 1 = x 1 y 1 4 = 1 x y a 3 ac 3 c 3 3 = 4acc a = 4ac 3 a x 3 4x + x 5. x 5 3 x 3 x + x 15 x 6 x + x 9 x + x 3 1 x 1 1 x 4 x 8 convert to exponent form 4 reduce the fractional exponents 1 x add exponents, then convert back to radical form: x 6. 4a - a = a = 11 a = 11/ x x 1 = 5 30, multiply by the common denominator 10 10(x + 1) + 3(x - 1) = x + 7 = 150 x = 143/13 = p - 15(0 - p) = 80, multiply through by 10 8p = 80 p = 110/8 = (-3) - (-3) + 4 = = (r + 1) - 3 = 4r +4-3 = 4r + 1
17 11. f() = 16() - 8 = 3-8 = 4 1. Since 0 can't be a denominator, x - 1 can't equal 0 The domain is all x except, x - 1 = 0 x = 1 x = 1/ Domain is all x except x = 1/ 13. Plug in 400 for C and solve for x: 400 = x 300 =.5x 600 = x 14. 5x + 15 = 3x x = 0 x = Let x = building height and y = antenna height, then x + y = 147 ft x - y = 108 ft x = 500 ft, add the two equations together x = 150 ft 150 ft + y = 147 ft, plug in x and solve for y y = ft x y 4 = 7 1, multiply by 1/ to get y/8 5x 1 + y 8 = 7 x 3 y = 3, add this to the above equation 8 5x 1 + x 3 = 7 + 3, solve for x 13 1 x = 13 x = y = 8 + y = 7, plug x into an original equation and solve for y 4
18 17. Use y - y 1 = m(x - x 1 ), where slope m is 3 and point (x 1,y 1 ) is (,-4) y - (-4) = 3(x - ) y + 4 = 3x - 6 y = 3x Solve y - x = 1 to find the slope of this line y = x + 1, the slope of this line is use the negative reciprocol of this slope, or -1/ for a line y ( ) = 1 (x 1) (similar to problem 14) y = 1 x Use m = y 1 y x 1 x for the slope thru points (x 1,y 1 ) and (x,y ) m = 4 3 ( 7) = 1 9 y 4 = 1 (x ), plug in slope and one of the points 9 y = 1 9 x Use d = rt, where d is distance, r is rate (speed), t is time Let x = speed of the plane and y = speed of the wind With the wind: r = speed of the plane + the wind: 600 = (x + y)(), divide by 300 = x + y gainst the wind: r = speed of the plane - the wind: 600 = (x - y)(3), divide by 3 00 = x - y dd the two equations: 300 = x + y 00 = x - y 500 = x 50 = x Plug x into one of the equations and solve for y: 300 = 50 + y y = x - < x - 4 x < -
19 . x - 4 = -8 or x - 4 = 8, remove and solve for ±8 x = -4 or x = 1 x = - or x = x + 6, isolate the term -6 4x+ 6, remove and solve with ±6-8 4x 4 - x 1, check for solution for ND or OR by graphing - 1 Use OR since the intervals don't overlap, so x - OR x x 3 + 8x - 7x - 3-4x 3 + x -x +7, remove (), combine like terms note: the - in front of the () changes the signs of all terms inside 6x x -8x x + 3x - 10x -, multiply (use FOIL) then combine like terms 15x - 7x - 6. Use difference of two squares: a - b = (a + b)(a - b) (9x) - y = (9x + y)(9x - y) 7. 3 x = 6 (product of end numbers) 6 = (-1)(-6) and = -7 (middle number) Replace -7y with -1y + -6y: 3y -y - 6y +, group terms in pairs and factor: y(3y - 1) -(3y -1), factor out (3y - 1): (3y - 1)(y - ) 8. (x + 5)(x 1), factor the numerator then cancel (x-1): x 1 x + 5
20 x 4 x 8x 4x + 6 4x x + 3 x x + 5 ( 1)(x 5) x x 15 x + 4x + 3, split up into seperate frations and simplify: x + 5 ( x 5)(x + 3) ( 1)(x + 5)(x 5) (x + 3)(x +1) 1 x + 1, invert second term and multiply, factor then cancel factors: 31. Multiply through by (x + )(x - ) which is the common denominator (x + )( x )( x x + ) = 7 (x + )(x ) x note that x -4 is (x + )(x - ) + 5(x - ) = 7(x + ) + 5x - 10 = 7x x = x = For roots, find x for f(x)=0: 0 = x - 5x + 6 factor to solve 0 = (x - )(x - 3) true when either factor is 0 roots are: and x = 8 convert to exponent form, then find x Since 3 = 8, x = log b x 4 + log b y - log b z 3 using the rule: c log b m = log b m c log b x 4 y - log b z 3 using the rule: log b m + log b n = log b mn log(x 4 y) / z 3 using the rule: log b m - log b n = log b m/n
21 35. log 4 x(x - 6) = write as one log (see #34 above) x(x - 6) = 4 convert to exponent form x - 6x -16 = 0 set to 0 and factor to solve (x - 8)(x + ) = 0 x = 8 or x = -, but the log of a negative is not allowed x = ( 3 + ) ( 3 + ) multiply simplify = = [ x x + 14] = 9(x + 1) 6x x +4 = 9x x + 1 = 9x + 9-7x = -3 x = 1/9 38. To find roots, expand, set equal to 0 and factor: x - x + x - = 10 x - x - 1 = 0 (x - 4)(x + 3) = 0 x = 4 and (-4 + i)(5-3i) = (-4)(5) + (-4)(-3i) + (i)(5) +(i)(-3i) = i + 10i -6i = -0 + I -6(-1) i = -1 = -0 + i +6 = i = 4 4i use i =-1 i
22 Geometry Practice Problems 1. C is an isosceles triangle with base C. L1 and L are parallel. 1=80. Find 4. L1 1 4 a. 80 b. 50 c. 45 d. 60. In the figure, the measure of arc C is 7 π / 4 and O is the center. of the circle. Find 1. a. 30 b. 50 c. 40 d Find the area of an equilateral triangle with a sides of length 1. a. 7 b. 7 c d Find the area of a circle inscribed in a square with sides of length 8 cm. a. 4π cm b. π cm c. 16π cm d. 8π cm 3 C O 1 C L 5. In the figure, 1=40. Find rc. a. 60 b. 40 c. 0 d Find the length of one of the equal sides of an isosceles triangle with a perimeter 105 if the base is one-third the length of one of the equal sides. a. 45 b. 15 c. 35 d n 8 ft by 10 ft garden is surrounded by a ft walkway. Find the area of thewalkway? a. 160 ft b. 8 ft c. 158 ft d. 88 ft
23 8. In the figure, =1, DE=9, and E=4. Find EC. a. 1 b. 16 D c. 13 d. 1 C E 9. Find the volume of a tent with length 9 ft, height 7 ft, and a 6 foot base. a. 567 ft 3 b. 189 ft 3 c ft 3 d. 16 ft The circle in the figure has a circumference of 10π inches. What is the area of the square circumscribed about the circle? a. 5 in b. 50 in c. 100 in d. 5π in 11. For the right triangle in the figure, find x. a. 5 b. 5 c. 3 d In the figure L1 and L are parellel. Find x. x 1 a. 18 b. 10 c. 9 d. 0 4x L1 5x L 13. π/3 radians is how many degrees? a. 60 b. 90 c. 10 d In the figure, C is a diagonal of rectangle CD. EF is perpendicular to and DC=35. Find EF. a. 35 b. 45 c. 55 d. 65 C E F D
24 15. The object in the figure has a square base with sides of length 4 and a semicircular top. Find the perimeter of the object. a. 16+π b. 1+π c. 16+4π d For the parallelogram in the figure =50. Find. a. 180 b. 50 c. 130 d Express 45 in radians. a. π/8 b. π/4 c. π/ d. π 18. In the figure, parallelgram CD has an area of 48. If C = 5 and E = 4, what is the perimeter of parallelogram CD? a. 6 b. 3 D E c. 34 d. 36 C 19. The volume of a right cylinder is 300 in 3. If the radius is doubled, what will the new volume be? a. 900 in 3 b. 400 in 3 c. 600 in 3 d. 100 in 3 0. Find the area of trapezoid CD in the figure below. C F E 45 D a. 90 b c d. 84
25 1. Find the volume of the tank in the diagram below. where the domes are hemispheres with diameter 6 inches. a. 63π in 3 b. 396π in 3 c. 360π in 3 d. 1544π in 3 3 ft.. Find the arclength of arc if O is the center, the measure of arc C is 300, and the radius of the circle is 10. a. 60 b. 60π c. 10π/3 d. 50π/3 C O 3. If C and abc are similar triangles with C=0, C=16, bc=1, =70, and c=60, find and ac. a. =50, ac=10 b. =60, ac=16 c. =70, ac=18 d. =50, ac=15 4. What is the volume of material left if a hole with a radius of 1 is drilled through a solid cube with sides of 4? (see drawing) a π b. 1-16π c. 16-4π d. 64-4π 5. In the figure below, the length of arc is π inches, the radius of the circle is 3 inches, and O is the center. Find the measure of 1. a. 30 b. 0 c. 40 d. 60 O 1
26 nswers 1. b. d 3. c 4. c 5. d 6. a 7. d 8. a 9. b 10. c 11. c 1. d 13. c 14. c 15. b 16. c 17. b 18. c 19. d 0. c 1. c. c 3. d 4. d 5. a Solutions = = = 100 C isosceles, so = 3, therefore = 50 Since L1 and L are parellel, = 4 4 = 50. arc C = π - 7π/4 = π/4 = 180 /4 = 45 Since 1 is a central angle, 1 = arc C 1 = n altitude from a vertex to an opposite side bisects the side. Use the Pythagorean formula to find the height h + 6 = 1 h = 6 3 rea = 1 ( base) ( height) = 1 ( 1) 6 3 ( ) = d = side of the square = 8 cm, but d is also the diameter of the circle r = (1/) d = 4 cm, where r is the radius of the circle rea of the circle = π r = π (4 cm) = 16π cm 5. 1 is an inscribed angle. rc length = twice the measure of the inscribed angle. rc = 1; rc = (40 ) = If the base = x then the equal sides = 3x Perimeter = = x + 3x + 3x = 7x x = 15, so equal sides = (3)(15) = rea of garden = (8 ft)(10 ft) = 80 ft The garden + walkway together have width 8 ft + ft + ft = 1 ft The garden + walkway together have length 10 ft + ft + ft = 14 ft rea of garden + walkway together = (1 ft)(14 ft) = 168 ft rea of walkway = 168 ft 80 ft = 88 ft
27 8. C and DEC are similar, so the ratios of corresponding sides are equal DE = C EC Let CE = x, then 1 9 = 4 + x x Cross multiply and solve for x: x = 1 9. Volume = (area of base) (height) The base is a triangle with base 6 ft and height 7 ft rea of base = (1/)(7 ft)(6 ft) = 1 ft Volume = (1 ft )(9 ft) = 189 ft Circumference = πd, where d is the diameter 10π in = π d d = 10 in, this is also the length of the side of the square rea of a square = side = (10 in) = 100 in 11. For right trangles a + b = c, where c is the hypotenuse x + 1 = x = 4-1 x = 3 1. L 1 and L are parellel so the angles are supplemental. 4x + 5x = 180 x = Use the fact that π radians equals 180 : (180 )/3 = C and D are parellel so DC = EF DC = 35 so EF = 35 EF = = Perimeter of base = = 1 Perimeter of Semicircle: C = (1/) π d d = 4 because of the base. C = (1/) π 4 = π Total perimeter = 1 + π
28 16. djacent andles in a parallelogram are supplemental + = = 180 = Use the fact that 180 equals π radians: 180 /π = 45 /x x = 45 π/180 x = π/4 18. rea parallelogram = (base) (height) 48 = 4(base) 1= base Perimeter = = V = π r h, where v is volume of a right cylinder, r is radius, and h is the height. When r is doubled, r is replaced by (r) = 4r This increases the original volume by 4 (300 in 3 ) (4) = 100 in 3 0. CDE is a so ED = 6 = 6 CE = ED, so CE = 6 F is a so F = 4 3 = 3 rea = (1/) (CE) (C + D) rea = (1/) (6) ( ) = V tank = V domes + V cylinder, but two domes = sphere, so V tank = V sphere + V cylinder V tank = 4 3 πr 3 + πr h where r is 3 inches and h is 36 inches V tank = 4 3 π 33 + π = 360π
29 . arc measure = arc measure C = = 60 O = 60, central angle equals the measure of the intercepted arc arclen = O 60 πr = π 10 = 10 3 π 3. Since the triangles are similar, all corresponding angles are equal and corresponding sides are proportional. So, C = c = 60 = C = = 50 C ac = C bc 0 ac = 16 ac = V = V cube - V cylinder V = side 3 - π r h = π 1 x 4 = 64-4π 5. arclen = O O πr π = π 3, solve for O O = 360 / 6 = 60 1 = (1/) O = (1/) 60 = 30
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