A finely sharpened pencil, the letter A, knife points.
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Classroom items that have acute angles include pencils, scissors, rulers, and notebooks. Acute angles are angles that measure less than 90 degrees, so any object with sharp corners or edges likely has acute angles. These items can be used to teach students about geometric concepts such as angles and shapes in a hands-on way.
An acute angle is an angle that is less than 90 degrees. The tip of a sharpened pencil is a very narrow acute angle. There are acute angles on a triangular yield sign. The tip of a football is an acute angle.
A triangle with 3 acute angles is an acute triangle. All the angles in an acute triangle are acute.
In an acute triangle, all three angles are acute.
A decagon can have acute angles.