Two-Dimensional and Three-Dimensional Shapes

Two-Dimensional and Three-Dimensional Shapes

What students learn

Students learn to recognize flat shapes and solid shapes, then describe them by their sides, corners, and faces. Start with 2D Shapes: Identify Flat Shapes to see the basic shape names.

Why it matters

Knowing shapes helps students describe objects in books, on signs, and in the world around them. 3D Shapes: Name Spheres and Cubes helps students notice that some shapes are solid, not flat.

Learn the idea

A 2D shape is flat like paper. A 3D shape has thickness and takes up space. 2D Shapes: Count Sides and Vertices shows how to count sides and vertices so students can describe a shape more carefully.

Try it

Sort real objects or drawings into flat shapes and solid shapes. Ask the student to name a shape, count its sides or vertices, and say whether it is flat or solid.

Parent guide

Use shape cutouts, blocks, boxes, or cans. Keep asking, "How do you know?" so the child uses shape language instead of just pointing.