4. Two angles of a quadrilateral are 72 and 56° respectively and the remaining two angles are in the ratio 3:5. Find the measure of each angle of the quadrilateral.
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Answer:
let 3x and 5x
72 + 56
= 128
3x+5x = 128
8x = 128
x = 128/8
x= 16
3x= 3×16 = 48
5x = 5×16= 80
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