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Definition: acute angle from The Penguin Dictionary of Mathematics

An angle between 0° and 90°.

Summary Article: acute angle from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Angle between 0° and 90°; that is, an amount of turn that is less than a quarter of a circle.

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Full text Article acute angle
Academic Press Dictionary of Science and Technology

An angle smaller than a right angle; an angle of less than 90°. ...

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