Solve for I
I = \frac{\pi ^ {2}}{4} \approx 2.4674011
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4I=\pi \pi
Multiply both sides of the equation by 2.
4I=\pi ^{2}
Multiply \pi and \pi to get \pi ^{2}.
\frac{4I}{4}=\frac{\pi ^{2}}{4}
Divide both sides by 4.
I=\frac{\pi ^{2}}{4}
Dividing by 4 undoes the multiplication by 4.
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