Question

Three angles of a quadrilateral are equal and the measure of the fourth angle is 120 degree . find the measure of each of these angles​

Answer 1

let the unknown angles be x

By angle sum property

x + x +x + 120° =360°

3x + 120° =360°

3x =360 - 120

x = 240/3

x =80

The measure of each angle is 80°