Evaluate
-\frac{7\pi ^{2}}{1620}\approx -0.042646439
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\frac{-7\pi \pi }{9\times 180}
Multiply -\frac{7\pi }{9} times \frac{\pi }{180} by multiplying numerator times numerator and denominator times denominator.
\frac{-7\pi ^{2}}{9\times 180}
Multiply \pi and \pi to get \pi ^{2}.
\frac{-7\pi ^{2}}{1620}
Multiply 9 and 180 to get 1620.
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