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An acute angle is an angle that is between 0 and 90 degrees. The supplement of the angle is 180 degrees minus the magnitude of the angle.

Since the original angle is greater than 0 degrees, the supplement must be less than 180-0 = 180 degrees.

Since the original angle is less than 90 degrees, the supplement must be greater than 180-90 = 90 degrees.

Thuis, the supplement measures between 90 and 180 degrees - that is, it is an obtuse angle.

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13y ago

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Q: Why is the supplement of an acute angle always obtuse?
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