Question

Radius of a circle is 3 meter, what would be the.radius of a circle whose area is 9 times the area of the first circle?​

Answer 1

Answer:

r= 3 meter

Let area of this circle be A

A=πr^2= 9π

Let r be the radius of another circle whose area is 9A

A/9A=9π/9πr^2

1/9=1/r^2

so r= 3