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Polygons and figures. Triangles

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Plane figures are flat. They can be closed or not closed.

 

Plane figures made up of three or more closed line segments are polygons. Each line segment of a polygon is a side. Polygons are classified by the number of sides. 

 

A triangle has three sides. There are different kinds of triangles.

 

 

 

 

How many triangles can you see?

FIGROUND04

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