![A point P and a triangle ABC, the distances from P to the three vertices of the triangle being known and the four points being coplanar [Un point P et un triangle ABC, les distances de P aux trois sommets du triangle étant connues et les quatre points étant coplanaires ]](image.jpg "A point P and a triangle ABC, the distances from P to the three vertices of the triangle being known and the four points being coplanar [Un point P et un triangle ABC, les distances de P aux trois sommets du triangle étant connues et les quatre points étant coplanaires ]")
A point P and a triangle ABC, the distances from P to the three vertices of the triangle being known and the four points being coplanar [Un point P et un triangle ABC, les distances de P aux trois sommets du triangle étant connues et les quatre points étant coplanaires].
