Step-by-step explanation:
let the angle be 3x, 7x,5x.
3x+7x+5x=180
15x=180
x=180/15
x=12
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Step-by-step explanation:
let the angle be 3x, 7x,5x.
3x+7x+5x=180
15x=180
x=180/15
x=12