An angle that measures less than 90 degrees is called an acute angle.

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Prepare for your Leaving Certificate Mathematics exam with a comprehensive practice test featuring key definitions. Use flashcards, multiple choice questions, and detailed explanations to ensure success and mastery of fundamental math concepts.

Multiple Choice

An angle that measures less than 90 degrees is called an acute angle.

Explanation:
Angles are grouped by how big they are. An angle that measures less than a right angle (90 degrees) is called an acute angle. For example, 30°, 45°, and 60° are all acute. A right angle is exactly 90°, an obtuse angle is between 90° and 180°, and a straight angle is 180°. So describing an angle smaller than 90° as acute matches the standard definition.

Angles are grouped by how big they are. An angle that measures less than a right angle (90 degrees) is called an acute angle. For example, 30°, 45°, and 60° are all acute. A right angle is exactly 90°, an obtuse angle is between 90° and 180°, and a straight angle is 180°. So describing an angle smaller than 90° as acute matches the standard definition.

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