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Polygons are a closed figure formed by line segments that meet only at their endpoints. Line segments are the sides and the points were the sides meet are the vertices. The angles formed by the adjacent sides are the angles of the polygon.

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Triangle

A triangle has three sides.

It has three angles.

"tri" means "3"

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A quadrilateral has four sides.

It has four angles.

"quad" means "4"

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A pentagon has five sides.

It has five angles.

"penta" means "5"

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A hexagon has six sides.

It has six angles.

"hexa" means "6"

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A heptagon has seven sides.

It has seven angles.

"hepta" means "7"

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An octagon has eight sides.

It has eight angles.

"octa" means "8"

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A nonagon has nine sides.

It has nine angles.

"nona" means "9"

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A decagon has ten sides.

It has ten angles.

"deca" means "10"