Question

the measure of an angle is twice the measure of its supplementary

Answer 1

Let the angle be x

x = 2 (180-x)

3x = 360

x = 120 degrees

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Answer 2

Hi friend
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Your answer
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Given that : - Measure of an angle is twice the measure of its supplementary angle.

Leer the angle be x.

Then, it's supplementary angle = 2(180 - x).

According to the question,
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x = 2(180 - x)

=> x = 360 - 2x

=> x + 2x = 360

=> 3x = 360

=> x = 360/3

=> x = 120°

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