Question

The angle subtended at the center of sphere by its surface area is equal to

Answer 1

Explanation:

4π steradians

The total solid angle of a sphere is 4π steradians. The basic unit of solid angular measure in the SI system, equal to the solid angle subtended at the center of a sphere by an area, on its surface, that is equal to the square of its radius: one sphere equals 4π steradians.