To solve an equation, we need to use inverse operations.

For \(\displaystyle{C}={2}π{r}\), the rr is being multiplied by 2π. To solve for r we would then need to divide both sides by 2π since division is the inverse operation of multiplication.

Dividing both sides of C=2πr by 2π gives \(\displaystyle\frac{{C}}{{2}}π={2}π\frac{{r}}{{2}}π.\)

Simplifying then gives C. \(\displaystyle{r}=\frac{{C}}{{2}}π.\)

For \(\displaystyle{C}={2}π{r}\), the rr is being multiplied by 2π. To solve for r we would then need to divide both sides by 2π since division is the inverse operation of multiplication.

Dividing both sides of C=2πr by 2π gives \(\displaystyle\frac{{C}}{{2}}π={2}π\frac{{r}}{{2}}π.\)

Simplifying then gives C. \(\displaystyle{r}=\frac{{C}}{{2}}π.\)