Question

Find the angle which is two times its supplementary angle.

Answer 1

so the angle is 120 ok

Answer 2

let the smaller angle be : 2x
Then the larger angle will be : x

2x + x = 180°
3x = 180°
x = 180/3
x = 60°

the smaller (supplementary) angle will be 2×60 i.e. 120°

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