Question

If the radius of a circle is doubled, what is the ratio of the circumference and diameter of the circle?​

Answer 1

Circumference: diameter=2π2r:2(2r)

=π

Answer 2

Step-by-step explanation

let the radius be 'x'

then diameter = 2x

circumference of smaller circle = 2πr

                                                      =2πx

circumference of bigger circle =2π×2x

                                                    =4πx

     ratio=2πx÷4πx

              =1÷2

or,           =1:2