Right triangle. Two angles are 45 degrees, and the third angle is 90 degrees. Two sides are equal.
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A four-sided polygon with four congruent sides and four equal angles is a square
Any 8 sided polygon is called an octagon. If all of the sides and angles are equal, then it's called a regular octagon.
An isosceles trapezoid has a pair of parallel sides and a pair of equal base angles
A regular polygon has equal angles AND sides.
A three-sided polygon is a triangle. The angles in a triangle add up to 180 degrees.