square degree

square degree
(sq deg)
   a unit of solid angle measure. Since one degree of ordinary angle measure equals pi/180 radians, one square degree is defined to be (pi/180)2 = 0.000 304 617 4 steradian. There are 4·1802/(pi) = 129 600/(pi) = 41 252.961 25 square degrees in a sphere.

Dictionary of units of measurement. 2015.

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