Quite often in mathematics we want to change which letter is the subject of the formula, the method for doing this is very similar to how we solve equations. We need to isolate \({t}\) so that it ...

With the radius as the subject, the formula is 𝒓 = √(𝑨/π). Using your maths skills, help to build bridges and bring light back to the islands in this free game from BBC Bitesize.