D=diameter... P=Pi(3.14159265)
pi x D
pi=3.14 it is really long # but we shorten is to 3.14. 3.14 times the diameter
A circumference is the distance around a circle. To find a circle's circumference you need to follow the formula: d*pi The d stands for diameter and pi is 3.14. You need to mulitply the length of the diameter by pi for the circumference. Or, if the diameter isn't given, multiply the radius by 2 and then multiply that by pi.
Divide the Diameter by 2 to get the Radius
Diameter = circumference/pi
To find the diameter of a circle given the area. The area of a circle = pi x the radius squared. To find the radius, then the diameter transpose the area formula, so A = Π * r^2 A/ Π = r^2 √A/ Π= r 2 x √A/ Π = d A = area Π = pi = 3.142 r = radius d = diameter
To find circumference you must multiply twice the radius by π, or using the diameter, if it gives it to you, multiply that by π.
12.5 km
pi=3.14 it is really long # but we shorten is to 3.14. 3.14 times the diameter
Dividing the circumference by 2*pi will give the value of the radius.
circumference=pi * diameter radius= 1/2 diameter
A circumference is the distance around a circle. To find a circle's circumference you need to follow the formula: d*pi The d stands for diameter and pi is 3.14. You need to mulitply the length of the diameter by pi for the circumference. Or, if the diameter isn't given, multiply the radius by 2 and then multiply that by pi.
Given is a circle. Not known is its area A. Not known is its radius r. Not known is its diameter d. You want to calculate its circumference C. Impossible. It cannot be calculated. The only other way is to measure it with a tape measure.
To find the diameter of a circle given the area. The area of a circle = pi x the radius squared. To find the radius, then the diameter transpose the area formula, so A = Π * r^2 A/ Π = r^2 √A/ Π= r 2 x √A/ Π = d A = area Π = pi = 3.142 r = radius d = diameter
Divide the Diameter by 2 to get the Radius
Diameter = circumference/pi
Pi x diameter
Diameter = circle's circumference/pi