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The plural of radius is radii
Radii
The noun radii is already a plural. The singular is radius.
radius = radii.
Oh, dude, I got you! So, like, "radius" is singular, it's just one of those lines from the center of a circle to the edge, you know? But when you're talking about more than one, you throw an "i" on there and get "radii." It's like adding toppings to your pizza, just a little extra flair.