Correct spellings for RADIUN
- Radian A radian is a unit of angle measure, equal to the angle subtended at the center of a circle by an arc equal in length to the radius.
- Radium Radium was once used in luminous paint, but its use has been discontinued due to its high radioactivity.
- Radius The circle's circumference is determined by multiplying its radius by 2Ï€.
