Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.
You can divide the diameter by two.
radius *2 = diameter so then plug the radius in... 4*2=8 8 is the diameter of the figure.
pi(3.14) divided circumference
Assuming you are talking about a circle:* If you know the radius of the circle, multiply that by 2. * If you know the circumference of the circle, divide that by pi. * If you know nothing, you need to measure either the radius, the diameter, or the circumference.
Sometimes because a sphere which is a 3d figure has a diameter
the inner diameter is the shaft diameter the out diameter you have to calculated
Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.
Multiply the diameter by pi (approximately 3.1416) to find the circumference.
Divide the circumference by pi, and that will give you the diameter.
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
If the circle is five feet across - that is the diameter.
You can divide the diameter by two.
diameter
If you know the radius, the diameter is 2R If you know the circumference, the diameter is C/R If you know the area ,the diameter is 4A/pi (pi=3.142)
radius *2 = diameter so then plug the radius in... 4*2=8 8 is the diameter of the figure.
pi(3.14) divided circumference