only if it is an equilateral triangle
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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.
It has one pair of opposite angles that are equal but not two.
The arrowhead has zero right angles.
no, all sides are equal but only all opposite angles are equal, except the special case of a square where all angles are equal to 90 degrees
You don't tell us enough information. In a square, there are four sides and four angles. The sides are all equal and the angles are all right angles. In a rectangle, there are four sides and four angles The opposite sides are equal and the angles are all right angles. There is no other shape in which all angles are right angles.