one angle of a quadrilateral is 120 degree and other three angles are equal. find the measure of each angle
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let the other three angles of quadrilateral be x
according to the question,
120 +x +x+x=360. (angle sum prop. of quad.)
120+3x=360
3x=360-120
3x = 240
x= 240/3
x= 80
according to the question,
120 +x +x+x=360. (angle sum prop. of quad.)
120+3x=360
3x=360-120
3x = 240
x= 240/3
x= 80
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