Steradian is the solid angle subtended at the centre of the sphere by its surface whose area is equal to _____ of the sphere.

Steradian is the solid angle subtended at the centre of the sphere by

1.	Steradian is the solid angle subtended at the centre of the sphere by its surface whose area is equal to _____ of the sphere.
Answer» the radius square of the radius cube of the radius reciprocal of the radius Answer :B