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About this video
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>Diameter of a circle< you are here
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Geometry
Diameter of a circle
Diameter formula
If you know the radius:
Given the radius of a circle, the diameter can be calculated using the formula
diameter = 2R
If you know the circumference
If you know the circumference of a circle, the diameter can be found using the
formula.
formula.
diameter =
______
π
C
C is the circumference of the circle and π is Pi, approximately 3.142
If you know the area
A is the area of the circle. And π is Pi, approximately 3.142
The radius is half of the diameter of a circle
d = 2 x radius
The diameter is the longest distance from one end of a circle
to the other; it is twice the radius.
to the other; it is twice the radius.