Solve P/md^2A=900*4/pid^2

$$\frac { P } { m d ^ { 2 } A } = \frac { 900 \times 4 } { \pi d ^ { 2 } }$$

Solve for P

$$P=\frac{3600Am}{\pi }$$

$$m\neq 0\text{ and }d\neq 0\text{ and }A\neq 0$$

Steps for Solving Linear Equation

The equation is in standard form.

$$\frac{1}{Amd^{2}}P=\frac{3600}{\pi d^{2}}$$

Divide both sides by m^{-1}d^{-2}A^{-1}.

$$\frac{\frac{1}{Amd^{2}}PAmd^{2}}{1}=\frac{3600}{\pi d^{2}\times \frac{1}{Amd^{2}}}$$

Dividing by m^{-1}d^{-2}A^{-1} undoes the multiplication by m^{-1}d^{-2}A^{-1}.

$$P=\frac{3600}{\pi d^{2}\times \frac{1}{Amd^{2}}}$$

Divide \frac{3600}{\pi d^{2}} by m^{-1}d^{-2}A^{-1}.

$$P=\frac{3600Am}{\pi }$$

Solve for A

$$A=\frac{\pi P}{3600m}$$

$$m\neq 0\text{ and }P\neq 0\text{ and }d\neq 0$$