Solve for a
\left\{\begin{matrix}a=-\frac{4\left(c-9\right)}{\pi nr}\text{, }&n\neq 0\text{ and }r\neq 0\\a\in \mathrm{R}\text{, }&\left(r=0\text{ or }n=0\right)\text{ and }c=9\end{matrix}\right.
Solve for c
c=-\frac{\pi anr}{4}+9
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ran\pi +4\times \left(\frac{\pi }{2}\right)^{2}+4c=\pi ^{2}+36
Multiply both sides of the equation by 4.
ran\pi +4\times \frac{\pi ^{2}}{2^{2}}+4c=\pi ^{2}+36
To raise \frac{\pi }{2} to a power, raise both numerator and denominator to the power and then divide.
ran\pi +\frac{4\pi ^{2}}{2^{2}}+4c=\pi ^{2}+36
Express 4\times \frac{\pi ^{2}}{2^{2}} as a single fraction.
ran\pi +\frac{4\pi ^{2}}{4}+4c=\pi ^{2}+36
Calculate 2 to the power of 2 and get 4.
ran\pi +\pi ^{2}+4c=\pi ^{2}+36
Cancel out 4 and 4.
ran\pi +4c=\pi ^{2}+36-\pi ^{2}
Subtract \pi ^{2} from both sides.
ran\pi +4c=36
Combine \pi ^{2} and -\pi ^{2} to get 0.
ran\pi =36-4c
Subtract 4c from both sides.
\pi nra=36-4c
The equation is in standard form.
\frac{\pi nra}{\pi nr}=\frac{36-4c}{\pi nr}
Divide both sides by rn\pi .
a=\frac{36-4c}{\pi nr}
Dividing by rn\pi undoes the multiplication by rn\pi .
a=\frac{4\left(9-c\right)}{\pi nr}
Divide 36-4c by rn\pi .
ran\pi +4\times \left(\frac{\pi }{2}\right)^{2}+4c=\pi ^{2}+36
Multiply both sides of the equation by 4.
ran\pi +4\times \frac{\pi ^{2}}{2^{2}}+4c=\pi ^{2}+36
To raise \frac{\pi }{2} to a power, raise both numerator and denominator to the power and then divide.
ran\pi +\frac{4\pi ^{2}}{2^{2}}+4c=\pi ^{2}+36
Express 4\times \frac{\pi ^{2}}{2^{2}} as a single fraction.
ran\pi +\frac{4\pi ^{2}}{4}+4c=\pi ^{2}+36
Calculate 2 to the power of 2 and get 4.
ran\pi +\pi ^{2}+4c=\pi ^{2}+36
Cancel out 4 and 4.
\pi ^{2}+4c=\pi ^{2}+36-ran\pi
Subtract ran\pi from both sides.
4c=\pi ^{2}+36-ran\pi -\pi ^{2}
Subtract \pi ^{2} from both sides.
4c=36-ran\pi
Combine \pi ^{2} and -\pi ^{2} to get 0.
4c=36-\pi anr
The equation is in standard form.
\frac{4c}{4}=\frac{36-\pi anr}{4}
Divide both sides by 4.
c=\frac{36-\pi anr}{4}
Dividing by 4 undoes the multiplication by 4.
c=-\frac{\pi anr}{4}+9
Divide 36-ran\pi by 4.
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