Question

Three angles of quardrilateral are equal and the fourth angle measure 120 degree what is the measure of each of the equal angles

Answer 1

Let one of the angle unknown angle be X.

Since three angles are equal thus the three angles are X.

Sum of all angles of a quadrilateral = 360°

X + X + X + 120 = 360

3X + 120 = 360

3X = 360-120

3X = 240

X = 240/3

X = 80°

So three angles are 80° each and fourth angle is 120°

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