|
|
 |
|
|
|
|
| ra·di·an [ ráydee ən ] (plural ra·di·ans) |
noun |
|
| Definition: |
| |
unit of angular measurement: a unit of angular measurement equivalent to the angle between two radii that enclose a section of a circle's circumference arc equal in length to the length of a radius. There are 2π radians in a circle.
Symbol rad
|
| [Late 19th century. <radius] |
|
|
|
