Sine and the Unit Circle
Author: Don Bindner
Date: 30 January 2014

A = Point(yAxis)
B = Point(xAxis)
c = Circle(A, B)
C = Point(c)
a = Segment(C, A)
α = Angle(B, A, C)
D: (α, sin(α))
b = Line(C, D)
d = Line(D, yAxis)
E = (0, -1.5)
e = Line(E, xAxis)
F = Intersect(d, e)
f = Segment(E, F)
G = Intersect(xAxis, yAxis)
H = Intersect(c, xAxis, 1)
g = CircleArc(G, H, C)