If the diameter is known, don't bother measuring the circumference.
Simply multiply the diameter by 'pi'.
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The half of a diameter of a circle is known as a radius.
measure/360=arc length/circumference. C=pi*diameter, so you now have (known value)/360=(known value)/(pi*diameter). With only one unknown value, you can now find the diameter.
It is the diameter.
The length around a circle is the circumference The length across a circle is the diameter
The radius is half the diameter, so divide the diameter by 2.