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The plural of radius is radii
Radii
The noun radii is already a plural. The singular is radius.
radius = radii.
In geometry, a radius is a line segment that connects the center of a circle to any point on its circumference. The plural form of radius is radii, which refers to more than one radius within the same circle or sphere. So, the main difference between radii and radius is that radii is the plural form of radius, indicating multiple line segments from the center to the circumference of a circle.