If I have to find the diameter and radius, then
Step 1: You need to tell me what circumference, C, is.
Step 2: Diameter, d = C/pi
Step 3: Radius, R = d/2.
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Diameter = radius * 2 Circumference = pi * diameter.
Diameter = circumference/pi Radius = circumference/2*pi
pi X diameter finds the circumference so circumference divided by pi will leave the diameter. half the diameter to find the radius
Divide circumference by pi, that gives diameter. Radius is half of diameter
You can either measure it, or calculate it if you know the diameter (radius = diameter / 2), or the circumference (radius = circumference / (2pi)).