Want to calculate the radius of a circle from its area or perimeter? Here are the key formulas that no one explains clearly! ...

To calculate the surface area of a cylinder ... Find the area of the cross-section using the formula for the area of a circle, \(A\) = π\(r\)². Multiply by the height of the cylinder.

The formula for the volume and surface area of a sphere will be given to you in the exam, so you will not need to memorise these. \(\text{The volume of a sphere} ~=~ \frac {4}{3} \times \pi \times ...