Let the angle be = x and complement angle = 4x we know that two angle is made of complement angle; = 4x + x = 5x = 5x = 90 so x = 90/5 = 18 so we say that 4x = 4×18 = 72 Ans
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x+4x=90 degree
5x=90 degree
x=90/5
x=18 degree
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