Basic shapes — circles, triangles, squares, and quadrilaterals

In this easy 1st grade geometry lesson, we study these BASIC SHAPES: circles, triangles, squares, and quadrilateral. The emphasis is on how many sides/corners they each have. We also study the meaning of the difficult word "quadrilateral" as a four-sided shape.

Then, we divide existing shapes into new ones and check what we get.

See also

Math Mammoth Early Geometry — a self-teaching worktext with explanations & exercises for beginning geometry topics (grades 1-3)

Math Mammoth Grade 1 complete curriculum

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