Solve for A
A=\frac{1}{\pi }\approx 0.318309886
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285=285A\pi
Divide 3420 by 12 to get 285.
285A\pi =285
Swap sides so that all variable terms are on the left hand side.
285\pi A=285
The equation is in standard form.
\frac{285\pi A}{285\pi }=\frac{285}{285\pi }
Divide both sides by 285\pi .
A=\frac{285}{285\pi }
Dividing by 285\pi undoes the multiplication by 285\pi .
A=\frac{1}{\pi }
Divide 285 by 285\pi .
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