One angle of a pentagon measures t∘. The other four angles are congruent to one another. Give the measure of one of those angles in terms of t.
some of interior angles of a pentagon = 180(3) = 540°
let each of the other four equal angles be x
t + 4x = 540
4x = 540-t
x = (540-t)/4 or x = 135 - t/4posted by Reiny