Redirected from Solid angle measure
Solid angle is measured in either radians^{2} or degrees^{2}. To obtain the solid angle in radians squared, multiply the fractional area by 4π. To obtain the solid angle in degrees squared, multiply the fractional area by 180^{2}/π which is equal to 129600/π. The SI unit of solid angle is the steradian (symbol sr), which is equal to radian^{2}.
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