The 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 diam See more
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The next equations show how you can instead find the diameter from them. The equation for diameter of a circle from circumference is: d=c/\pi d = c/π. If written instead in terms of the radius, the diameter is very simple; it's just twice as
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