Question

Consider a circle whose size can vary. Let r r represent the radius of the circle (in cm) and let C C represent the circumference of the circle (in cm). Suppose the function f f determines the circumference of the circle in cm, C C, given its radius length in cm, r r. Write a function formula for f f.

Answer 1

Answer:

  f(r) = 2πr

Step-by-step explanation:

You know the formula for circumference in terms of radius is ...

  C = 2πr

You are being asked to write this as a function named "f". That will be ...

  f(r) = 2πr

Answer 2

Answer:

$f(r)=2\pi r$

Step-by-step explanation:

The formula for circumference of a circle is

$C=2\pi r$

where,

C represent the circumference of the circle.

r represent the radius of the circle.

It is the function f  determines the circumference of the circle in cm, C C, given its radius length in cm, r.

So, the circumference of the circle is defined by the function

$f(r)=2\pi r$

Therefore the required formula for function f is $f(r)=2\pi r$.