The Solid Angle of a Plane Triangle

@article{vanOosterom1983TheSA,
  title={The Solid Angle of a Plane Triangle},
  author={Adriaan van Oosterom and Jan Strackee},
  journal={IEEE Transactions on Biomedical Engineering},
  year={1983},
  volume={BME-30},
  pages={125-126}
}
An analytical expression is presented for the solid angle subtended by a plane triangle at some arbitrary point in space. Using this expression, the time required for numerical computation is cut down to one third. 

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