To work out the area of a circle: Find the value of the radius. If the diameter is given, this must be halved. Substitute the value of the radius into the formula for the area of a circle.

It also separates the area into two segments - the major ... Remember the circumference of a circle = \(\pi d\) and the diameter = \(2 \times \text{radius}\). The arc length is \(\frac{1}{ ...