Which description defines an obtuse angle?

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Multiple Choice

Which description defines an obtuse angle?

Explanation:
An obtuse angle is an angle that opens wider than a right angle but not as wide as a straight angle. In standard measures, a right angle is 90 degrees and a straight angle is 180 degrees, so any angle with a measure between 90 and 180 degrees is obtuse. The description that says an angle greater than 90 degrees but less than 180 degrees matches this range exactly. Angles greater than 180 degrees are reflex angles, a full rotation is 360 degrees, and angles less than 90 degrees are acute, so those descriptions don’t describe obtuse angles.

An obtuse angle is an angle that opens wider than a right angle but not as wide as a straight angle. In standard measures, a right angle is 90 degrees and a straight angle is 180 degrees, so any angle with a measure between 90 and 180 degrees is obtuse. The description that says an angle greater than 90 degrees but less than 180 degrees matches this range exactly. Angles greater than 180 degrees are reflex angles, a full rotation is 360 degrees, and angles less than 90 degrees are acute, so those descriptions don’t describe obtuse angles.

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