Factor
2\pi r\left(r+13\right)
Evaluate
2\pi r\left(r+13\right)
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2\left(\pi r^{2}+13\pi r\right)
Factor out 2.
\pi r\left(r+13\right)
Consider \pi r^{2}+13\pi r. Factor out \pi r.
2\pi r\left(r+13\right)
Rewrite the complete factored expression.
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