An angle that measures between 90 and 180 degrees is called an obtuse angle.

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Multiple Choice

An angle that measures between 90 and 180 degrees is called an obtuse angle.

Explanation:
Angles are classified by size. An obtuse angle is defined as an angle that measures more than 90 degrees but less than 180 degrees. The statement describes an angle that lies between 90 and 180 degrees, which precisely matches that definition, so it identifies an obtuse angle. Remember the endpoints: 90 degrees is a right angle, and 180 degrees is a straight angle, so they are not included in the obtuse range. For contrast, an acute angle is under 90 degrees, and a reflex angle is between 180 and 360 degrees. For example, 120 degrees is obtuse, 60 degrees is acute, 90 degrees is right, and 210 degrees is reflex.

Angles are classified by size. An obtuse angle is defined as an angle that measures more than 90 degrees but less than 180 degrees. The statement describes an angle that lies between 90 and 180 degrees, which precisely matches that definition, so it identifies an obtuse angle. Remember the endpoints: 90 degrees is a right angle, and 180 degrees is a straight angle, so they are not included in the obtuse range. For contrast, an acute angle is under 90 degrees, and a reflex angle is between 180 and 360 degrees. For example, 120 degrees is obtuse, 60 degrees is acute, 90 degrees is right, and 210 degrees is reflex.

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