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The radius of a circle is a line that starts at the center of the circle and ends somewhere along the perimeter of the circle. The diameter is a line that starts at the perimeter of a circle, goes through the center of the circle, and ends at the opposite perimeter of the circle. This a diameter is twice as long as a radius and can be thought or as consisting of two radii.

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Q: How is the diameter related to the radius of a circle?
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Related questions

How are diameter and radius related?

The diameter of a circle is twice its radius.


What is half of the diameter?

A radius is half of the diameter of a circle or a sphere. Scroll down to related links and look at "Diameter - Wikipedia" or "Radius - Wikipedia"


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