| 释义 |
CircumcircleA Triangle's circumscribed circle. Its center  is called the Circumcenter, and its Radius  theCircumradius. The circumcircle can be specified using Trilinear Coordinates as
 | (1) |
 and Tarry Point  lie on the circumcircle.
A Geometric Construction for the circumcircle is given by Pedoe (1995, pp. xii-xiii). The equation for thecircumcircle of the Triangle with Vertices  for  , 2, 3 is
 | (2) |
 | (3) |
Completing the Square gives
 | (8) |
 | (9) |
and Circumradius
 | (12) |
References
Pedoe, D. Circles: A Mathematical View, rev. ed. Washington, DC: Math. Assoc. Amer., 1995.
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