Solve DeltaS=2pir

$$\Delta S = 2 \pi r$$

Solve for S

$$\left\{\begin{matrix}S=\frac{2\pi r}{\Delta }\text{, }&\Delta \neq 0\\S\in \mathrm{R}\text{, }&r=0\text{ and }\Delta =0\end{matrix}\right.$$

Steps for Solving Linear Equation

The equation is in standard form.

$$\Delta S=2\pi r$$

Divide both sides by \Delta .

$$\frac{\Delta S}{\Delta }=\frac{2\pi r}{\Delta }$$

Dividing by \Delta undoes the multiplication by \Delta .

$$S=\frac{2\pi r}{\Delta }$$

Solve for r

$$r=\frac{S\Delta }{2\pi }$$

Steps for Solving Linear Equation

Swap sides so that all variable terms are on the left hand side.

$$2\pi r=\Delta S$$

The equation is in standard form.

$$2\pi r=S\Delta$$

Divide both sides by 2\pi .

$$\frac{2\pi r}{2\pi }=\frac{S\Delta }{2\pi }$$

Dividing by 2\pi undoes the multiplication by 2\pi .

$$r=\frac{S\Delta }{2\pi }$$