Question

Trapezoid A B C D is shown. Sides A B and D C are parallel. Sides A D and B C are congruent. Angle B is (3 x) degrees and angle D is (9 x) degrees. What is the value of x in trapezoid ABCD?

Answer 1

x=15

Explanation:

Just took the test on edge 2020 and got it right.

Answer 2

x = 15°

Explanation:

AD = BC = > ∡A = ∡B = 3x

∡C = ∡D = 9x

∡A + ∡D = 180°

3x + 9x = 180°

12x = 180°

x = 180° : 12

x = 15°