Explanation:

let the angle be 'x'

Supplementary=180°-x

4 times its supplementary=4(180°-x)

SO-

X = 4(180-X)

=>X = 720-4X

=>X+4X = 720

=>5X = 720

=>X = 720/5 = 144°

SO THE REQUIRED ANGLE IS 144°.

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Answer:

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