An arrowhead typically has two equal angles. The two angles are formed by the two sides of the arrowhead meeting at the tip. These angles are typically acute angles, each measuring less than 90 degrees.
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It has one pair of opposite angles that are equal but not two.
only if it is an equilateral triangle
The arrowhead has zero right angles.
Two or three.
Depends. Most of the time the angles are acute or obtuse