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Find the sum of the measures of the interior angles of a convex 30-gon. 5040 5400 360 168 30 Find the measure of one interior angle of a convex decagon. 80 180 1440 144 360 Find the sum of the measures of the exterior angles of a convex 21-gon. 210 21 180 3420 360 If the measure of each interior angle of a regular polygon is 108, find the number of sides in the figure. 72 5 9 15 108 Find x for parallelogram ABCD if BC = 3x + 20 and AD = 5x – 12. 16 4 10.25 21.5 5 Parallelogram ABCD has vertices A(0,0), B (2,4) and C(10,4). Find the possible coordinates of D. (8,0) (10,0) (0,4) (10,8) (0, 8) ABCD is a rectangle with diagonals AC and BD. If AC = 2x + 10 and BD = 56, find x. 18 33 78 122 23 Find the median of a trapezoid with bases of 15 m and 27 m. 6 12 21 19 24 The length of one base of a trapezoid is 44, the median is 36 and the other base is 2x + 10. Find x. 17 9 21 40 35 x Find x. 138 30 102 66 60 2x + 10 X-20 X + 40 On a coordinate plane, the four corners of Ronald’s garden are located at (0,2), (4, 6), (8, 2) and (4, -2). Which of the following most accurately describes the shape of Ronald’s garden? square rectangle rhombus trapezoid parallelogram Find x and y so that ABCD will be a parallelogram. A X = 6, y = 42 X = 6, y = 22 B X = 20, y = 42 X = 20 , y = 2 X = 8, y = 34 32˚ 4x 24˚ (y-10)˚ C D In trapezoid DEFG, find the measure of angle D. 28 72 108 136 44 E 136 D F 72 G K For rhombus GHJK, find angle 1. G 1 J 22⁰ H 68 22 44 90 111 Determine whether ABCD is a parallelogram. Justify your answer. B A Yes; opposite sides congruent (T6.9) No; not enough information D Yes: opposite sides parallel (def’n of parallelogram) Yes; opposite angles congruent (T6.10) Yes; opposite sides congruent (T6.3) C Given rectangle ABCD, find the measure of angle ABD. D A 9 3x + 6 21 B 51 39 44 5x - 4 C Name the missing coordinates for the rectangle with length twice the width. B(0,a) C(?,?) C(2a, b) , D(2a, 0) C(2a,a) , D(2a, 0) C(a, b) , D(a, 0) C(a, b) , D(0, a) C(2a, b) , D(0, 2a) A(0,0) D(?,?) Give the reason for the second line A in the proof. Given: ABCD is parallelogram Prove: AC ≠ BD D C B given statement reason ABCD is parallelogram given CPCTC AD ≅ CB ? substitution T6.3; opposite sides of a parallelogram are congruent T 6.9; opposite sides congruent make a parallelogram