Evaluate
63\pi \approx 197.920337176
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81\pi -3\times 3\pi \times 2
Multiply 9 and 9 to get 81.
81\pi -9\pi \times 2
Multiply 3 and 3 to get 9.
81\pi -18\pi
Multiply 9 and 2 to get 18.
63\pi
Combine 81\pi and -18\pi to get 63\pi .
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