Question

The area of a circle is 40cm.
Calculate the circumference of the circle

Answer 1

Answer:

circumference is 22.63 cm.

see the process in the picture given above.

Answer 2

Answer:

Circumference of circle is 22.36cm

Step-by-step explanation:

Given that

Area of circle is 40cm sq.

To find

circumference of circle

Solution

Let r as radius of circle

As we know that

$area \: of \: circle = \pi \times {r}^{2}$

hence

$r = \sqrt{ \frac{40}{\pi} }$

put

$\pi = 3.14$

hence

$r = 3.56cm$

now as we know that

$circumference \: of \: circle = 2\pi \times r$

$= 2 \times 3.14 \times 3.56$

by multiplication we get

$circumference \: of \: circle = 22.368cm$