The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
diameter = circumference/pi
You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi
circumference = pi x diameter
by timesing the circumference by pie
Earth's Circumference is 24,901 miles (40,075 km)
Eratosthenes is credited with calclating the circumference of the Earth at the equivalent of 25,000 miles/40,000km in about 205 BCE.
The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
The circumference of the Earth measured between the North and South poles is approximately 40,007.86 kilometers.
google it :P (The circumference of the earth at the equator is 24,901.55 miles)
Pi X D = Circumference. To find Diamater if you know Circumference, divide Circumference by Pi (3.14).
Diameter = Circumference/pi
You divide the circumference by pi.
Circumference = π * Diameter
diameter = circumference/pi
If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
You cannot find the diameter of something from its circumference unless it is a circle and, in that case, diameter = circumference/pi