Polygons (3rd grade geometry lesson)

What is a polygon? It is a closed shape made up of line segments (straight sides). I show examples of polygons and non-polygons. Then we'll go on to learn the names for common polygons from triangles to decagons (10-sided shape). And lastly, we investigate dividing a polygon into others by drawing a diagonal into it.

See also

Quadrilaterals — video lesson

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