sin(Y) = (A) 5 13 음 (B) 12 (C) 12 13 (D) 12 17. Each exterior angle of a regular polygon measures 45". IS How many sides has the polygon? (A) 10 (B) 6 (C) 8 (D) 4 18. The lengths of the sides of a triangle are x, 2r and 2x centimetres. If the perimeter is 20 cm, what is the value of x? (A) 4 (B) 8 (C) 5 (D) 10 19. Each exterior angle of a regular polygon measures 120' How many sides does the polygon have? (A) 3 (B) S 20. 20 cm A (C) 4 (D) 6 40 A In the diagram above, not drawn to scale, BD is a diameter. Z ABD = 25°. What is the size of ZACB? (A) 25° (B) 65" (C) 155 (D) 40" 3's 22 In the isosceles triangle shown above, the value of x is (A) 55" (B) 145° J А с (C) 35° (D) 110 23 120° B D In the figure above, AB is parallel to CD, and ZJEB - 120°, What is the size of ZKTD? (A) 120" (B) 60" (C) 90 (D) 500 B The triangle ABC above is right - angled at A ZABC = 40" and AC = 20 cm. The length of BC, in cm, is (A) 20 tan(40") (B) 20 x sin 40° (C) 20 sin(40") (D) 20 x cos40