@futurebird
the numerator is clearly the area of a portion of pizza. The denominator is a trap to keep the unwary confused and befuddled while ants steal the pizza.
@futurebird Let's see: if b is a chord subtended by angle \theta, then b/2 = r sin(\theta/2), so the fraction simplifies to \theta r^2/2, which is the area of the sector subtended by \theta.
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