- 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 4·180^{2}/(pi) = 129 600/(pi) = 41 252.961 25 square degrees in a sphere.

*Dictionary of units of measurement.
2015.*

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