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radius=1/2 circumference

Oops! Not true. The radius equals 1/2 the diameter of a circle, and the diameter equals the circumference divided by Pi (3.14...). But none of this answers the question, so:

Any segment of the circumference of a circle is called an "arc" and the size of the arc is usually expressed in degrees.

A 900 arc, for instance, would go 1/4 of the way around the circle, since a full circle is always 3600. Halfway round would be 900, 1/3 of the way 1200, and so on.

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14y ago

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Wiki User

13y ago

An arc.

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Q: What is a part of a circumference?
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