Solve for C. Leave your answer in simplest
radical form.

The formula for the circumference of a circle is

 C = 2π·r

or

 r = C/(2π)

The radius r of cylinder A is

 r = (4π)/(2π) = 2

The formula for the area of a circle is

 A = π·r²

or

 r = √(A/π)

The radius of cylinder B is

 r = √(9π/π) = 3

The dimensions of cylinder A must be multiplied by 3/2 to produce the corresponding dimensions of cylinder B.