1 . x2+y2-gx=0

• A. $\frac{1}{8}{\mathrm{\pi g}}^2$
• B. $\frac{1}{4}{\mathrm{\pi g}}^2$
• C. $\frac{1}{2}{\mathrm{\pi g}}^2$
• D. ${\mathrm{\pi g}}^2$

Answer: Option B

Explanation: