It's probably a triangle. A triangle has three sides and three angles.
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A polygon with 7 sides and 7 angles is a heptagon.
a polygon with 4 right angles and 4 sides of the same length
A polygon has an equal number of sides and angles. For example, a triangle has 3 sides and 3 internal angles.
A pentagon has five sides and angles.
A polygon with 6 equal sides and angles is called a hexagon.