Question

Find the following ratio.

The ratio of radius to circumference of the circle.

Answer 1

Let the radius of the circle be r units.
∴ Circumference of the circle = 2πr units
Radius of the circle : Circumference of the circle = r : 2πr = `r / (2πr) = 1/ (2π) = 1 : 2π`
Thus, the ratio of radius to cirumference of the circle is 1 : 2π