Identify three-dimensional figures

Key Notes :

🔷 What are Three-Dimensional Figures?

• Three-dimensional (3D) figures have length, width, and height (or depth).
• They are also called solid figures.

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🔷 Common 3D Figures and Their Features

Figure	Faces	Edges	Vertices	Example
Cube	6 square faces	12 edges	8 vertices	Dice
Cuboid (Rectangular Prism)	6 rectangular faces	12 edges	8 vertices	Book, Box
Sphere	0 faces	0 edges	0 vertices	Ball
Cylinder	2 circular faces, 1 curved surface	2 edges	0 vertices	Can
Cone	1 circular face, 1 curved surface	1 edge	1 vertex	Ice cream cone
Pyramid (Square base)	5 faces (1 square and 4 triangles)	8 edges	5 vertices	Egyptian pyramid

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🔷 Important Terms to Remember

• Face: A flat or curved surface.
• Edge: Where two faces meet (a straight line).
• Vertex (plural: vertices): A corner where edges meet.

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🔷 Real-Life Connections

Students should identify 3D shapes in the real world, like:

• Ball → Sphere
• Cereal box → Cuboid
• Birthday hat → Cone
• Soup can → Cylinder

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🔷 Difference Between 2D and 3D Figures

• 2D figures are flat (like a square or circle).
• 3D figures have depth and can be held or seen from different angles.

Learn with an example

let’s practice!