Question

What is the correct SI unit for measuring a solid angle?

Options

• Steradian (sr)

• Radian (rad)

• Degree (^o)

• Metre squared (m²)

Answer 1

Steradian (sr)

Explanation:

The steradian (sr) is the SI unit of solid angle, defined as the solid angle subtended at the centre of a sphere by an area equal to r² on its surface.