Evaluate
\frac{\pi a^{2}}{2}
Expand
\frac{\pi a^{2}}{2}
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2\pi \left(-\frac{1}{2}\right)^{2}a^{2}
Expand \left(-\frac{1}{2}a\right)^{2}.
2\pi \times \frac{1}{4}a^{2}
Calculate -\frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{1}{2}\pi a^{2}
Multiply 2 and \frac{1}{4} to get \frac{1}{2}.
2\pi \left(-\frac{1}{2}\right)^{2}a^{2}
Expand \left(-\frac{1}{2}a\right)^{2}.
2\pi \times \frac{1}{4}a^{2}
Calculate -\frac{1}{2} to the power of 2 and get \frac{1}{4}.
\frac{1}{2}\pi a^{2}
Multiply 2 and \frac{1}{4} to get \frac{1}{2}.
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