The correct answer is:
C=2πr
This formula shows that the circumference (C) of a circle is directly proportional to the radius (r), with a constant of proportionality equal to 2π. In other words, if you double the radius, you double the circumference; if you triple the radius, you triple the circumference, and so on.
However, there is no direct formula that relates the circumference and the area of a circle. You can use the formula A=πr^2 to calculate the area of a circle, but there is no simple way to express the area in terms of the circumference or vice versa. You can use some geometry and algebra to derive some approximations, but they are not exact formulas.
Which of the following expressions correctly shows the relationship between the circumference and the area of a circle?
A=πr * 2
C=2πr
(C * 2) = 4πA
Cd=π
1 answer