Mathematics for IGCSE & O level - Equations (Section 7 - No. 7)

The formula for the area of a circle is A = πr². If we want to make 'r' the subject, the first step is:

Divide both sides by π

Multiply both sides by π

Take the square root of both sides

Add π to both sides

To isolate r², divide both sides by π first: A/π = r²