state the SI unit of solid angle.
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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
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The steradian (symbol: sr) or square radian
Explanation:
The steradian, like the radian, is a dimensionless unit, the quotient of the area subtended and the square of its distance from the center.
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