Question

find the area of the circle whose diameter is 20 CM ​

Answer 1

Answer:

Area of circle = πr²

and Radius = Diameter/2= 20/2= 10

and value of π if not given will be = 22/7

Now,

πr²= 22/7×10×10

= 22/7×100

= 2200/7

=314.2cm² Approx.

Answer 2

Answer:

Given :

Diameter = 20 cm

So radius = d/2

= 20/2

= 10cm

formula of Area of circle

$\pi \times {r}^{2}$

putting values in above formulae

$area \: of \: circle = \frac{22}{7} \times 10 \times 10$

$area = \frac{22}{7} \times 100$

$area = 22 \times 14.28$

$area = 314.16 {cm}^{2}$