Question

the radius of a circle is 3 metre what is the conference of another circle whose area is 49 times that of the first

Answer 1

Answer: 131.88 m

Step-by-step explanation:

1) Area of 1st circle

= πr^2

= 9π m^2

2) area of second circle = 49 times the first

Area of second circle = 49 x 9π

= 441 π m^2

3) Radius of the second circle

πr^2 = 441 π

=> r^2 = 441

=> r = 21 m

4) circumference of the second circle

= 2 π r

= 2 x 3.14 x 21

= 131.88 m