Evaluate
336\pi \approx 1055.575131606
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\pi \times 144+\pi \times 12\times 16
Calculate 12 to the power of 2 and get 144.
\pi \times 144+\pi \times 192
Multiply 12 and 16 to get 192.
336\pi
Combine \pi \times 144 and \pi \times 192 to get 336\pi .
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