Examples and properties of three-dimensional shapes.

 

CLASS: Basic 3

SUBJECT: Mathematics

TOPIC:  Three-dimensional shapes (Revision)

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.

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

  3. A cube has ________ vertices.

  4. How many edges has a sphere?

  5. Draw a cone.

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

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