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)|
|Cylinder (Circle-based Prism)|
Look at the gym equipment. Identify 3 prisms.
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.
|Tetrahedron (Triangle-based pyramid)|
|Cone (Circle-based pyramid)|
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.