Question

Heptagon has three equal angles each of 120 degree and four equal angles find the size of equal angles

Answer 1

180 * (n - 2) is the number of degrees in an n-gon

180 * (7 - 2) = 4 * 132 + 3x
180 * 5 = 528 + 3x
900 - 528 = 3x
372 = 3x
124 = x