It is radii which is the plural of radius
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radii
The plural form of radius is radii.
the word 'radius-es' doesn't exist, the word 'radii' is the plural of 'radius'
A radius is a radius. It does not have six names.
Radii is the plural of the word radius.If you have a circle, bisect it with a straight line - that is the diameter. Cut that in half - that is the radius. The radius is the distance from the center to the edge of the circle.A radius is one half the diameter of a circle ( the straight line distance from one point of the edge of a circle to the other side, directly in the middle). The plural form of radius is radii.