Question

Three angles of a quadrilateral all equal and the measure of the fourth angles is 120degree .Find the measure of each of the equal angles

Answer 1

Heya

In a quadrilateral, sum of all the angles is 360

Let the equal angles be x

We get,

x+x+x+120 = 360

3x = 360-12

3x = 240

x = 240/3 = 80

Each of the equal angle measures 80°

Answer 2

Hey there
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Let x be the angle other than 120°

since , it is an quadrilateral

we know

The sum of the angle of a quadrilateral = 360

so

x + x + x + 120° = 360

→ 3x = 360° - 120°

→ 3x = 240

→ 3x = 3 × 80

→ x = 80


Hence the measure of other three angles are

80° each


Hope this would help you