The two sides of a coin are called head and tail.
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A triangle which has no two sides congruent is called a Scalene Triangle.
A point that two sides of a polygon have in common is called a vertex. Each regular polygon has an equal number of sides as vertices.
A triangle that has at least two congruent sides is called an isosceles triangle. It has two equal sides and two equal angles.
the intesection of the two sides of an angle is the angle 's?
the intersection of the two sides of an angle is called its