Template:SI dimensionless units
From Wikipedia, the free encyclopedia
| Name | Symbol | Quantity | Definition |
|---|---|---|---|
| radian | rad | angle | The unit of angle is the angle subtended at the centre of a circle by an arc of the circumference equal in length to the radius of the circle. There are 2π radians in a circle. |
| steradian | sr | solid angle | The unit of solid angle is the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere having an area r2. There are 4π steradians on a sphere. |
