Question

the area of circle is 661^2cm. finds its circumference​

Answer 1

Answer:

88cm

Step-by-step explanation:

Given,

πr2=616

r2=22616×7

r2=28×7

r=14

Therefore, Circumference = 2πr=2×722×14=88 cm

Answer 2

Answer:

circumference of circle is 91.10cm.

Step-by-step explanation:

Given that

Area of circle is 661 cm sq.

To find

circumference of circle

Solution

As we know that

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

hence

$661 = \pi \times {radius}^{2}$

put

$\pi = 3.14$

hence

$radius = \sqrt{ \frac{661}{3.14} }$

by solving we get

$radius \: = 14.5cm$

now as we know that

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

$= 2 \times 3.14 \times 14.5$

by multiplication we get

$circumference \: of \: circle = 91.106cm$