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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.
i thing radius of gyration does not depend upon mass because it is the distance between reference axis and the centre of gravity.
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.
The surface area is 1,385.4 cm2
It is a graph of all points which are are the same distance (the radius) from a fixed point (the centre).