Question

Area of the curve $x^{2}+y^{2}=2 a x$ is

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

Answer 1

Answer: (D)

By L.H. Rule, given $=\underset{x \rightarrow 0}{lt}\left[\frac{\frac{1}{3+x}-\frac{1}{3-x}}{1}\right]=\frac{1}{3}+\frac{1}{3}=\frac{2}{3}$