If radius of a circle is 3 cm, what is the area of the circle in sq. cm ?

Answer: Option B

Given: Radius of a circle = 3 cm
Area of circle :
$$\begin{array}{rl}& =\pi r^2\\ & =\pi \times 3^2\\ & =9\pi \text{ sq}\text{.}\text{cm}\end{array}$$