Question

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

Answer 1

Answer:

given three equal angles is 80 degree.

And suppose forth angle is x.

Since, (sum of all interior angles of A quadrilateral) = 360 degree.

so, 80+80+80+x=360 degree.

=> x = ( 360 - 240) degree

=> x = 120 degree

Answer 2

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Answer:

Given,

Measure of each three angles =80 degree

Therefore total angle of the three angles=240 degree

Total sum of the angles of a quadrilateral =360degree

Therefore Measure of the fourth angle=360-240= 120degree