triangulo esferico

A = (-1.763348691144298, -2.9892440816214454, 0.9999999999999991)
a = Sphere(A, 2)
B = PointIn(a)
C = PointIn(a)
D = PointIn(a)
c = CircleArc(A, B, C)
d = CircleArc(A, C, D)
e = CircleArc(A, D, B)