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.
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A finely sharpened pencil, the letter A, knife points.
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.