Radii
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It is halves that is the plural to a half
Half a diameter is known as the radius.
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.
The plural of "half" is halves.
Half of diameter is radius. 2r=d