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The formula for the area of a circle is π r². To use this formula we first need to find r, the radius of the circle. The radius is the distance from the centre of the circle to the edge, and...

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In this example, we want to find values for both x and y which are our unknowns. 

So we start by rearranging x to be on its own but still in terms of y. We then can plot it into the next ...

With sequences we should follow the general formula of An + B.

The n refers to the position in the sequence i.e. for the 3rd number in the sequence (whic...

We can calculate the area of a circle using the following formula:A = pi x r²The area we are given is 16pi. Therefore, we can divide both sides by pi. So,16pi = pi x r²becomes16 = r<...