Differentiate w.r.t. r
2\pi r
Evaluate
\pi r^{2}
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\frac{\mathrm{d}}{\mathrm{d}r}(\pi r^{2})
Multiply r and r to get r^{2}.
2\pi r^{2-1}
The derivative of ax^{n} is nax^{n-1}.
2\pi r^{1}
Subtract 1 from 2.
2\pi r
For any term t, t^{1}=t.
\pi r^{2}
Multiply r and r to get r^{2}.
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