1.  Play with points A and B making the circle bigger and smaller and moving the radius.
2.  What do you notice about the relationship between the tangent line and radius?

A = (1.12, 0.84)
B = (4.34, 1.8)
c = Circle(A, B)
a = Segment(A, B)
b = Tangent(B, c)
C = Point(b)
α = Angle(C, B, A)
text1: "m∠ABC: " + α + ""