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.

1. 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.

1. 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.

1. 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.

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

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

1. Sphere, E.g balls

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

EVALUATION:

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

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

1. A cube has ________ vertices.

1. How many edges has a sphere?

1. Draw a cone.

1. State the three attributes of three-dimensional shapes.