To find the equation of a circle when you know the radius and centre, use the formula \({(x - a)^2} + {(y - b)^2} = {r^2}\), where \((a,b)\) represents the centre of the circle, and \(r\) is the ...

Rearranging the formula for the circumference of a circle makes the radius the subject. Start with the new subject and write out the function machine for the formula, showing each operation step ...