Answer:
45°
135°
Step-by-step explanation:
Let the measure of one angle be x
So, measure of its supplementary angle = 3x

(x^2) - 16 / x+4 = (x-4)(x+4) / (x+4) = x-4, x not equal to -4
D is the answer.
It is

The equation for area of a trapezoid is

Substituting our values in

We can then simplify the expression

N is the amount of sides
sum=13 times 180 =2340