A heart is not technically a geometric shape, but it depends on how you draw a heart. If the angles measure less than 90 degrees, they are acute angles.
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In an acute triangle, all three angles are acute.
There can be 1 or 2 acute angles.
there are three acute angles in an acute triangle, because there are three corners.
The letter "N" as two acute angles.
None: a circle has no angles, and certainly no acute ones.