Question

.A quadrilateral has three acute angles, each measure 80.What is the measure of the fourth angle?

Answer 1

Total sum of all angle of quadrilateral is 360°

each of three angles is 80°
so total sum of angle of that three angle is
3(80)=240°

so fourth angle=360°-240°
=120°

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Answer 2

Angle 1 = 80°
Angle 2 =80°
Angle 3 =80°
ANGEL SUM PROPERTY
angle 1 + angle 2 + angle 3 + angle 4 = 360°
80+80+80+angle 4=360
240+angle 4=360°
360-240=angle 4
Ans.) 120°= angle 4