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SAI International School

Sub – Mathematics

Class - IV

Topic – Geometry

Sub topic 3 : 2 D and 3 D shapes

Shapes are of two types –i) 2D-shapes

ii)3D-shapes

2D-shapes:

 It has 2 dimensions that is length and breadth.
 They are also called as flat shapes.
 Ex- Rectangle, square, triangles etc.

Square- A square has 4 sides and 4 vertices.

Rectangle- A rectangle has 4 sides and 4 vertices .

Triangle- A triangle has 3 sides and 3 vertices.

Circle- A circle has no sides and no vertices.

3D- Shapes:

 It has 3 dimensions that is length ,breadth and height.
 They are also known as solid shapes.
 Ex- Cube, cuboid, sphere and cone etc.

Cuboid- A cuboid has 6 faces, 12 edges and 8 vertices.

Cube- A cube has 6 faces,12 edges and 8 vertices.