2016 State Mathematics Contest Geometry Test
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1 2016 State Mathematics Contest Geometry Test In each of the following, choose the BEST answer and record your choice on the answer sheet provided. To ensure correct scoring, be sure to make all erasures completely. The tiebreaker questions at the end of the exam will be used to resolve ties in first, second, and/or third place. They will be used in the order given. Complete the 25 multiple choice questions before attempting the tiebreaker questions. Figures are not necessarily drawn to scale. 1. In the figure to the right, if α = 2β 26, the measure or angle α is a. 45 b. 64 c. 50 d In a triangle, if the length of the hypotenuse is 11, what is the length of the side opposite the 60 angle?!! a.! b. 11 3!!! c.! d e.!!!! 3. In the figure below, 5AC = 8DE. If AD = 24, then AB = a. 64 b. 40 c. 88 d. 32 e. 56
2 4. To circumscribe a triangle, which of the following must be constructed? a. The perpendicular bisectors of two sides. b. The bisectors of two angles. c. The altitudes of the triangle. d. The diameter of the circle.. 5. The base angles of an isosceles triangle are 30. If the length of the base is 15, find its area. Round to the nearest tenth. a b c d In the figure below, find α if m BCD = 3β. a. 45 b. 55 c. 66 d. 37 e. Not enough information 7. Write the equation of the circle with the segment whose endpoints are 2, 5 and (4, 7) as a diameter. a. x + 2! + y 5! = 180 b. x + 1! + y 1! = 45 c. x 4! + y + 7! = 180 d. x 1! + y + 1! = 180 e. x 1! + y + 1! = If a regular pentagon is circumscribed by a circle of diameter 20, what is the length of a side? Round to the nearest hundredth. a b c d e
3 For problems 9 11, consider the following proof. Given: A circle with center C with chords QR ST Prove: QR ST Statements Reasons 1. QR ST 1. Given 2. CQ CS, CR CT 2.? 3. ΔCQR CST 3.? 4. QCR SCT 4. Corresponding angles of congruent triangles are congruent. 5. QR ST 5.? 9. Which reason justifies the statement in step 2 of the proof? a. Definition of midpoint. b. In a given circle, all radii are congruent. c. Corresponding sides of congruent triangles are congruent. d. Definition of distance Which reason justifies the statement in step 3 of the proof? a. Side-Angle-Side b. Angle-Side-Angle c. Angle-Angle-Side d. Side-Side-Side. 11. Which reason justifies the statement in step 5 of the proof? a. Congruent chords have congruent corresponding arcs. b. If the radii are congruent, then the arcs are congruent. c. Congruent central angles cut off congruent arcs. d. Vertical angles cut off congruent arcs..
4 12. If the triangle in the figure is rotated counterclockwise about the origin through an angle of 90, what will be the coordinates of the image of C(3, 5)? a. 3, 5 b. 5, 3 c. 5, 3 d. ( 3, 5) 13. In the right triangle below, if AB = 35 and AC = 28, then BD = a b c d e Which of the following points is on the perpendicular bisector of the segment with endpoints 4, 1 and (8, 3)? a. 4, 1 b. (8, 3) c. ( 1, 0) d. ( 2, 1) e. (3, 2) 15. Assuming that AB AD, Find the area of the trapezoid in the figure. a. 15 +!!! b c !" d.!
5 For problems 16 and 17, consider the following proof. Given: AB CB, AF CF, AE and CD intersect at F Prove: AD EC. Statements 1. AB CB, AF CF, AE and CD intersect at F. 1. Given Reasons 2. BCA BAC, FCA FAC 2.? 3. m BCA = m BCD + m ECA, 3. Angle Addition Postulate m BAC = m BAE + m EAC 4. m DAF = m ECF 4. Subtraction Property of Equality 5. DAF ECF 5. Definition of Congruence 4. DFA EFC 4. Vertical angles are congruent. 6. DAF ECF 6.? 7. AD EC 7. Corresponding sides of congruent triangles are congruent. 16. Which reason justifies the statement in step 2 of the proof? a. Corresponding angles of congruent triangles are congruent. b. Sides opposite congruent angles are congruent. c. Angles opposite congruent sides are congruent. d. Angle Addition Postulate 17. Which reason justifies the statement in step 6 of the proof? a. Side-Angle-Side b. Angle-Side-Angle c. Angle-Angle-Side d. Side-Side-Side.
6 18. If a sphere has radius 6, find the ratio of the volume of the sphere to its surface area. a. 6:1 b. 3:1 c. 4:3 d. 12:1 e. 2:1 For problems 19 and 20, refer to the figure below. Assume that AB EF, D is on AF, FN is an altitude of DEF, m DFE = 90, and AD = If M is the midpoint of AB, what is the length of the shortest path from M to N entirely within the polygon? a. 55 b c d e If BC = AF, find the radius of a circle whose area is equal to the area of the figure. a b. 10 c d In the figure to the right, the inscribed circle has area 200π. Find the area of the square. a b. 200 c. 800 d
7 22. In the figure to the right, the coordinates D are a. (a + c, b + d) b. a c, b d c. c a, d b d. ac, bd 23. If two angles of a triangle are 52 and 25, which of the following would be an exterior angle of the triangle? a. 103 b. 61 c. 33 d. 155 In the isosceles triangle to the right, ED BC, the ratio of BE to EA is 3:2, and AC = What is the area of the trapezoid EDCB? a b c d What is the length of BE? a b c d. 7.43
8 Name: Tie Breaker #1 In circle P, AC = BC and m ACB =! m ABC. Find the measure of BPC.!
9 Name: Tie Breaker #2 In the figure, AB is a diameter of the circle and AB DC. Express the area of the circle in terms of x.
10 Tie Breaker #3 Name: The figure below is a rectangle. Find the value of x.
11 Answer Key State Geometry Exam 1. B 2. C 3. A 4. A 5. E 6. C 7. E 8. E 9. B 10. D 11. C 12. B 13. D 14. E 15. A 16. C 17. B 18. E 19. D 20. A 21. C 22. C 23. D 24. B 25. A
12 Tie Breaker #1 In circle P, AC = BC and m ACB =! m ABC. Find the measure of BPC.! Since AC = BC, m ABC = m BAC. Let β = m ABC. Then m ACB =!! β. Therefore, Since BAC is an inscribed angle, Since BPC is the central angle of BC, β + β + 2 β = β = β = 81 mbc = 2β = 162 m BPC = 162
13 Tie Breaker #2 In the figure, AB is a diameter of the circle and AB DC. Express the area of the circle in terms of x. Since AB is a diameter of the circle, APB is inscribed in a semicircle and is therefore a right triangle with APB being a right angle. By vertical angles, CPD is also a right angle so APB CPD. Also, since AB DC, BAP DCP by alternate interior angles. Therefore APB~ CPD. Hence we have the proportion By Pythagorean Theorem, AP AB = CP CD CP = x! 36 Therefore, we have 8 AB = x! 36 x 8x = AB x! 36 Therefore the radius of the circle is Therefore the area of the circle is 8x AB = x! 36 r = 1 2 AB = 4x x! 36 A = πr! = 16πx! x! 36
14 The figure below is a rectangle. Find the value of x. Tie Breaker #3 By Pythagorean Theorem, we have 1. a! + c! = 4! 2. a! + d! = 5! 3. b! + c! = x! 4. b! + d! = 8! Subtracting equation (1) from equation (2) and equation (3) from equation (4), we get 5. d! c! = 5! 4! 6. d! c! = 8! x! Combining equations (5) and (6), we get 8! x! = 5! 4! 64 x! = 9 x! = 55 x = 55
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