Question

What's the diameter and radius with the circumference of 40

Answer 1

circumference = pi x Diameter.
Diameter = circumference/ pi
Diameter = 40/pi = 12.7
Radius = 1/2 Diameter
Radius = 1/2 x 12.7 = 6.35

Answer 2

The number is the ratio of the circumference of a circle to its diameter. The value of is approximately 3.14159265358979323846...The diameterof a circle is twice the radius. Given the diameter or radius of a circle, we can find the circumference