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:


Prisms

Cube (Square-based prism)Diagram of a cube
Rectangular PrismDiagram of a rectangular prism
Triangular PrismDiagram of a triangular prism
Cylinder (Circle-based Prism)Diagram of a cylinder

Question - Prisms in Gym Equipment

Home gym machine

Look at the gym equipment. Identify 3 prisms.

Did You Know That...?

Light 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.

Pyramids

Square-based pyramidDiagram of a square-based pyramid
Tetrahedron (Triangle-based pyramid)Diagram of a tetrahedron
Cone (Circle-based pyramid)Diagram of a cone

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.