Factor
\frac{\pi \left(2H-1\right)a^{2}}{2}
Evaluate
\frac{\pi \left(2H-1\right)a^{2}}{2}
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\frac{2\pi a^{2}H-\pi a^{2}}{2}
Factor out \frac{1}{2}.
\pi a^{2}\left(2H-1\right)
Consider 2\pi a^{2}H-\pi a^{2}. Factor out \pi a^{2}.
\frac{\pi a^{2}\left(2H-1\right)}{2}
Rewrite the complete factored expression.
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