GCSE Mathematics/Area and Volume

Area of a square
To work out the area of a square, take one side, and multiply it by itself, as all sides on a square are equal.

Area of a rectangle
To work out the area of a rectangle, multiply one of one of the sets of parallel sides, by one of the other set of parallel sides.

Area of a circle
To work out the area of a circle, use the formula

$$\mathrm{Area} = \pi r^2.\,$$.

In the equation, r, the radius is the line from the circumference of a circle (the outside) to the center point.