Question

What is the ratio of the area of a circle with the radius r to the circumference of the circle?

Answer 1

The area of the circle:
`A_O=\pi r^2`

The circumference of the circle:
`C_O=2\pi r`

The ratio:
`(A_O)/(C_O)=(\pi r^2)/(2\pi r)=(r)/(2)`