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

A. $6 π$ sq. cm

B. $9 π$ sq. cm

C. $\frac{3 π}{2}$ sq. cm

D. $9 π^{2}$ sq. cm

Solution:

Given: Radius of a circle = 3 cm
Area of circle :

\begin{aligned} = π r^{2} \\ = π \times 3^{2} \\ = 9 π sq . cm \end{aligned}

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