Find a function that models the area a of a circle in terms of its circumference c

find a function that models the area a of a circle in terms of its circumference c.

find a function that models the area a of a circle in terms of its circumference c.

Answer:

⇒ A / C = πr2 / 2πr

⇒ A / C = r / 2

⇒ A = Cr / 2