Question

The area of the circle $x^2+y^2-2x+4y-4=0$ is

• A. 6$\pi$ sq. units
• B. 9$\pi$ sq. units
• C. 7$\pi$ sq. units
• D. 16 $\pi$ sq. units

Answer 1

Answer: (B)

Equation of given circle is $x^2+y^2-2x+4y-4=0$
Centre (-1, 2) and Radius= 3
$\therefore$ Area of circle = $\pi \times 3^2=9\pi$ sq. units