Question

what is the value of x in trapezoid ABCD

Answer 1

So the trapezoid has 2 parallel sides making segments AD and BC  transversals

Therefore making angle c and angle b add up to 180

(180-3x) + 3x + 180-9x +9x

180 +12x = 360

180= 12x
x= 15

Answer 2

Answer:

x = 15

Step-by-step explanation:

9x + 3x = 180

12x = 180

x = 15