In order to prove these triangles congruent by SAS, AB and DE must be congruent. Thus, C is your answer.
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Given:
Sum of interior angle
To find:
Number of sides of a polygon
Solution:
Using sum of interior angles formula:

where "S" is the sum of interior angels and "n" is the number of sides of a polygon.
Divide by 180° on both sides.

Cancel common factor 180°.

Add 2 on both sides.


Switch the sides.

Therefore number of sides of a polygon is
.
When you subtract them you get the answer 57.99
Ok......... so ignore the pay part, that is not his pay but the 8% comission inclusive of the tax