Three-Dimensional Solids

Three-dimensional Solids have dimensions in 3 directions - length, width and depth. In geometry, we are mainly interested in three types of 3D solids which are:


Cube (Square-based prism)Cube diagram
Rectangular PrismRectangular diagram
Triangular PrismTriangular diagram
Cylinder (Circle-based Prism)Cylinder diagram

Question - Prisms in Gym Equipment

Gym Equipment

Look at the gym equipment. Identify 3 prisms.

Did You Know That...?

Colour spectrum shining out of a prism

This triangular prism is dispersing white light into the seven light wavelengths of the visible light spectrum - red, orange, yellow, green, blue, indigo and violet. What we cannot see with our human eyes is the invisible light including radio waves, microwaves, infra-red, ultra-violet, x-rays and gamma-rays.


Square-based pyramidSquare-based Pyramid diagram
Tetrahedron (Triangle-based pyramid)Tetrahedron diagram
Cone (Circle-based pyramid)Cone diagram

Did You Know That...?

Halite crystals

Use a magnifying glass to look very closely at the salt in your kitchen. The crystals of table salt (also known as sodium chloride and halite) are in the shapes of cubes.