# Three-dimensional shapes

CLASS: Basic 3

SUBJECT: Mathematics

TOPIC: Three-dimensional shapes

CONTENT:

Three-dimensional shapes are shapes which can be measured in 3 directions. These shapes are also called solid shapes. They have Length,

width, and height which are the three measurements of the three-dimensional shapes.

Examples of three-dimensional shapes are:

Cube

Cuboid

Cylinder

Cone

Sphere

Three-dimensional shapes have many

attributes such as:

Vertices

Faces, and

Edges.

Vertices: These are points where 3 edges meet.

Faces: These are the flat surfaces of the three-dimensional shapes.

Edges: These are the line segment where two faces meet. Don’t worry the diagram below will explain it better.

Examples and properties of three-dimensional shapes.

- Cube, E.g dice, st. Luis cube sugar etc.

- It has 6 faces.
- It has 12 edges.

*It has 8 vertices.

Each face of a cube is square in shape.

- Cuboid, E.g rectangular box, rectangular cupboard etc.

- It has 6 faces
- It has 12 edges.
- It has 8 vertices.

Each face of a cuboid is rectangle in shape.

- Cylinder, E.g Gas cylinder, milo tin, milk tin etc.

- It has 2 circular faces.
- It has 1 curved surface.
- It has 2 circular edges.

- Cone, E.g Ice cream, Christmas cap etc.

- It has 1 circular base.
- It has 1 curved surface.
- It has 1 circular edge.

- Sphere, E.g balls

- It has no vertex.
- It has no edge.
- It has 1 curved surface.

EVALUATION:

- List three objects in your environment that have the shape of cylinder.

- List two objects in your environment that have the shape of sphere.

- A cube has ________ vertices.

- How many edges has a sphere?

- Draw a cone.

- State the three attributes of three-dimensional shapes.