We can relate the **Three dimensional geometry** to that of the **Two dimensional Co-ordinate geometry** to understand it easily.

In **Two dimensional geometry **we have the **x axis** and the **y axis**.

Whereas in **Three dimensional geometry** we have the third axis which is the **z-axis**.

“An object that has height width and depth”-eg: Cuboid

The definition of the 2D geometry is:

“An object that has only two dimensions” (ie) Width and Height eg: Rectangle

ð All the formulae related to three dimensional geometry are similar to that of the formulae related to two dimensional geometry, except that it has an extra

‘z’ co-ordinate.

ð We can relate the three dimensional figure to the respective two dimensional one and hence arrive at the formula.

For Example:

The cuboids can be related to that of a rectangle, a cube to that of a square and sphere to that of a circle.

For Example:

Here arecouple of examples on clay6 based on the above tip