Evaluate
-\frac{665\pi ^{2}}{4}\approx -1640.821731681
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\frac{-133\pi \times 15\pi }{3\times 4}
Multiply \frac{-133\pi }{3} times \frac{15\pi }{4} by multiplying numerator times numerator and denominator times denominator.
\frac{-133\times 5\pi \pi }{4}
Cancel out 3 in both numerator and denominator.
\frac{-133\times 5\pi ^{2}}{4}
Multiply \pi and \pi to get \pi ^{2}.
\frac{-665\pi ^{2}}{4}
Multiply -133 and 5 to get -665.
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