Evaluate
\frac{675\pi }{4}\approx 530.143760293
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\pi \times \frac{15}{4}\times 45
Divide \pi \times 45 by 12 to get \pi \times \frac{15}{4}.
\pi \times \frac{15\times 45}{4}
Express \frac{15}{4}\times 45 as a single fraction.
\pi \times \frac{675}{4}
Multiply 15 and 45 to get 675.
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