Evaluate
30\pi \approx 94.247779608
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30\pi
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\frac{1}{2} \cdot 2 * \pi \cdot {(18 + 12)}
Substitute 2 * \pi for \tau.
\pi \left(18+12\right)
Cancel out 2 and 2.
\pi \times 30
Add 18 and 12 to get 30.
\frac{1}{2} \cdot 2 * \pi \cdot {(18 + 12)}
Substitute 2 * \pi for \tau.
\pi \left(18+12\right)
Cancel out 2 and 2.
\pi \times 30
Add 18 and 12 to get 30.
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