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)
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If the circle is five feet across - that is the diameter.
Divide the circumference by pi, and that will give you the diameter.
The formula for the area of a circle is: area = pi x radius2. The radius is half the diameter.
The radius of a circle is half of its diameter
pi times the diameter