Diameter - Math.net
https://www.math.net/diameter
WEBThe diameter of a circle is twice the length of the circle's radius. The two radii of length r, shown above for the circle, form diameter d. Since each radius of a circle has equal measure, d = 2r or . Diameter and chords. A chord is a line segment whose endpoints are on a circle. If a chord contains the center, it is also a diameter of the circle.
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