The following shape has three sides and the only angles are right angles.
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A triangle is a shape with three sides and three angles. This is a very basic shape taught to young children.
An equilateral triangle has three equal sides and three equal angles.
Triangle
uhh, a triangle?
Five side is always a pentagon, but there's no pentagon that always has exactly one right angle. A regular pentagon has no right angles. An irregular pentagon can have one, two, or three right angles, or none.