What is the plural of radius?

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Tags

1. #center
2. #their
3. #plural
4. #english
5. #segments
6. #either
7. #conventional
8. #radius
9. #latin
10. #length
11. #radii
12. #usage
13. #classical
14. #radiuses
15. #modern
16. #sphere
17. #geometry
18. #perimeter
19. #circle