All the radii of a circle are of equal length. The radius is the distance from the center of the circle to the out edge. Having equal radii is what defines a circle.
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The radius(radii is the plural) of the circle is half the distance of circle's diameter. The formula is r=(1/2)diameter.
A radii is just a plural form of radius. A circle doesnt have one radius. The term radii is mostly used when talking about multiple circles.
As per the dictionary, a circular chart cut by radii into segments illustrating relative magnitudes or frequencies -called also circle graph. See the related link for verification.
No it isn't. Line graphs are used for that. Circle graph show values compared to all of the values.