The measure of an angle which is four times its supplement is:

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• A 36°
• B 144°
• C 150°
• D 45°

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Answer: B. 144°

Let the angle be x. Its supplement is 180° - x.
x = 4(180° - x)
x = 720° - 4x
5x = 720°
x = 144°.

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