Question

Question
Three angles of a Quadrilateral are equal and
the measure of fourth angle is 120°. Find the
measure of each of the equal angles.​

Answer 1

Step-by-step explanation:

Let the measure of the equal angle be x.

By the angle sum property of a quadrilateral,

x + x + x + 120 = 360

which means 3x  = 360-120

which means x = 240/3 = 80°

Therefore the measure of each of the equal angles is 80°.

Hope it helps...

Answer 2

Step-by-step explanation:

Let x be the one of the three equal angles.

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°