If a circle has a circumference (c) of 240mm, it's diameter (d) can be calculated by using the following formula:
c = d * pi
d = c / pi
d = 240 / 3.14
d = 76.39 mm
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The radius is half of the diameter of a circle.
Diameter of a circle = circumference/pi
The radius of a circle is half of its diameter
The radius of the circle is half the diameter of the circle. 30mm radius would mean 60mm diameter or 6cm.
The distance around a circle is the circumference. The diameter of a circle is the distance across the center of a circle.