Solve 90^circ=pioperatorname{rad}?

$$90 ^ { \circ } = \pi \operatorname { rad } ?$$

Solve for a

$$a=\frac{90}{\pi dr}$$

$$d\neq 0\text{ and }r\neq 0$$

Steps for Solving Linear Equation

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

$$\pi rad=90$$

The equation is in standard form.

$$\pi dra=90$$

Divide both sides by \pi rd.

$$\frac{\pi dra}{\pi dr}=\frac{90}{\pi dr}$$

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

$$a=\frac{90}{\pi dr}$$

Solve for d

$$d=\frac{90}{\pi ar}$$

$$a\neq 0\text{ and }r\neq 0$$

Steps for Solving Linear Equation

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

$$\pi rad=90$$

The equation is in standard form.

$$\pi ard=90$$

Divide both sides by \pi ra.

$$\frac{\pi ard}{\pi ar}=\frac{90}{\pi ar}$$

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

$$d=\frac{90}{\pi ar}$$