1 . x2+y2-gx=0

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

Answer: Option B

Explanation: