Question

Which of the following is the correct plural form of radius? Select all that apply.
A. radiuses
B. radius's
C. radii
D. radia

Answer 1

The plural form of the word radius is radii.

I know it sounds weird, but this is correct. Adding -s  at the end of the radius would make the word grammatically incorrect. This is because the word radius itself is a Latin word.


- Marlon Nunez