Question

What is the S. I unit of solid angle?

Answer 1

steradian (sr) is the S. I unit of solid angle

Answer 2

The SI unit of solid angle is the steradian (sr). The solid angle of a complete sphere is 4π sr. The solid angle corresponding to the face of a cube measured at the centre is 2π/3 sr. One steradian is equal to (180/π)2 square degrees.