An octagon has 8 sides and 8 angles.
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No polygon can have less than 3 angles. It would be a triangle with 3 sides but that has 3 angles.
A triangle has three sides and three angles that total 180 degrees.
rectangle
A rhombus has 4 equal sides. Its angles can be right angles, but don't have to be. A square is a type of rhombus.
a quadrilateral