Consider a circle whose size can vary. The circumference of the circle is always 2n times as large as its radius. Let r represent the radius of the circle (in

cm) and let C represent the circumference of the circle (in cm). a. What is the approximate value (rounded to 2 decimal places) of 2n? b. Write a formula that expresses C in terms of r. c. As the radius of a circle, r, increases from 2 cm to 6 cm, the circumference of the circle increases from __________ to _________. d. A circle's circumference is _______ times as large as the circle's diameter, d. e. What is the relative size of (how many times as large) a circle's' circumference C to its diameter, d? f. Write an equation to determine the radius of a circle, r, that has a circumference of 23 cm