P: (0, 0, 3)
B: (2, 0, 3)
C: (0, 2, 3)
A: (0, 0, 1)
E = Plane(B, C, A)
d1, j1, j3, j2 = Polygon(A, C, B)
Q = PointIn(E)
v = Vector(P, Q)
d: abs(v)
Text1: "d(P, Q) = " + d + ""
f = Segment(P, B)
g = Segment(P, C)
h = Segment(P, A)