A pentagon has five sides. The Pentagon building in the US is five sided, which is why it is called The Pentagon. An octagon has eight sides.

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How Many Sides Does a Pentagon Have

A pentagon is a five-sided polygon with internal angles that total 540 degrees.

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In geometry, a pentagon (from the Greek pente and gonia, meaning five and angle) is any five-sided polygon. A pentagon may be simple or self-intersecting. The sum of the internal angle...