I believe the answer is A.
X is 20 because 20/5 is 4 n 4+1=5
Answer:

Step-by-step explanation:
The expression is for the interior angle of the hexagon; one interior angle is equal to
.
Since an interior angle of a hexagon measures 120°, we have the equality
.
Now it is just a matter of solving for 

Step-by-step explanation:
Please specify values so we may answer. Judging by the looks of the question, this uses the concept of similarity