Mathematics for IGCSE & O level - Equations (Section 8 - No. 24)
If the area of a circle is 28.26 cm², and you know the formula is A = πr², what are the first steps to rearrange to find the radius?
Divide by π, then multiply by 2.
Divide by π, then square root.
Square root, then divide by π
Multiply by π, then square root.
Explication
To isolate r, divide both sides by π, then square root.