Question

The diameter of a circle is 4 cm. Then its area is…………sq. cm.​

Answer 1

$\Large{\underline{\underline{\bf{Solution :}}}}$

☯ Given :

Diameter of circle = 4 cm.

$\rule{200}{1}$

☯ To Find :

We have to find the area of circle.

$\rule{200}{1}$

☯ Solution :

We know that,

$\Large{\implies{\boxed{\boxed{\sf{Radius = \frac{Diameter}{2}}}}}}$

✝ Put Values

$\sf{\rightarrow Radius = \frac{\cancel{4}}{\cancel{2}}} \\ \\ \sf{\rightarrow Radius(r) = 2 \: cm}$

$\rule{150}{2}$

Now,

$\Large{\implies{\boxed{\boxed{\sf{Area = \pi r^2}}}}}$

✝ Putting values in above written formula.

$\sf{\rightarrow Area = \frac{22}{7} \times (2)^2} \\ \\ \sf{\rightarrow Area = \frac{22}{7} \times 4} \\ \\ \sf{\rightarrow Area = \frac{88}{7}} \\ \\ \sf{\rightarrow Area = 12.57} \\ \\ \Large{\implies{\boxed{\boxed{\sf{Area = 12.57 \: cm^2}}}}}$