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.
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The number is infinite.
The radius is the distance from the centre point of the circle to ANY point on the circumference.
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.
The radius(radii is the plural) of the circle is half the distance of circle's diameter. The formula is r=(1/2)diameter.
yes
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.
70% of a circle.