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A three radii refers to a geometric figure with three radii originating from the same center point. In a circle, the radii are lines drawn from the center to any point on the circumference, and having three radii means there are three such lines extending from the center. The radii of a circle are always equal in length, as they all have the same distance from the center. Having three radii is a characteristic of certain shapes, such as equilateral triangles inscribed in circles.
A radius is a radius. It does not have six names.
2 radii = one diameter
the single form of radii is radius
It is radii which is the plural of radius