Answer:

Step-by-step explanation:
The <u><em>Triangle external angle theorem</em></u> states that :An exterior angle of a triangle is equal to the sum of the opposite interior angles. For more on this see
see the attached figure with letter to better understand the problem
step 1
Find the measure of the interior angle at B
we know that
----> by supplementary angles (form a linear pair)

step 2
Find the value of x
Applying the triangle external angle theorem

solve for x



simplify

Answer:
36
Step-by-step explanation:
X equals 12, substitute X for 12
3(12)=36
Answer:
D
Step-by-step explanation:
This is an eye scanning