Answer:

Step-by-step explanation:
Given: pentagon (5 sided polygon), two interior angles =
each, other three interior angles are congruent.
Sum of angles in a polygon = (n - 2) × 
where n is the number of sides of the polygon.
For a pentagon, n = 5, so that;
Sum of angles in a pentagon = (5 - 2) × 
= 3 × 
= 
Sum of angles in a pentagon is
.
Since two interior angles are right angle, the measure of one of its three congruent interior angles can be determined by;
- (2 ×
) =
- 
= 
So that;
the measure of the interior angle = 
= 
The measure of one of its three congruent interior angles is
.