Coxeter- Exercise 3.5.2
Yes, A'B'C' is a harmonic sequence. M is the harmonic conjugate of B' with respect to A' and C'. We have H(B'M, A'C'), H(C'M, B'D'), ...
Triangles and Angles Sada
Derivative of Cosine
Finish Draft 2
Arches (Parabola, Catenary, Circular)
Triangle with given sides (SSS)
Pursuit Paths via Complex Numbers