Sides and corners

Ages 3 to 5 Read and do together · about 10 minutes

Read together

A triangle has three sides and three corners.

A square has four sides and four corners.

Do it

1. Cut out a triangle, a square and a circle from paper.
2. Count the sides by running a finger along each edge. Count the corners by pointing.
3. Which shape has no corners? Which has the most?
4. Look around for shapes: a window (rectangle), a slice of pizza (triangle), a plate (circle).

Talk about it

• How many sides does it have?
• Where is a triangle in our home?

For the grown-up

Counting sides and corners connects counting with geometry. A circle has no corners and one curved side.

Mark as done

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Where this comes from

This is a play and practice activity with no factual claims to source.

Written with AI assistance and checked against the sources listed. Please read it before sharing it with a child.