Rechtwinkliches Dreieck
Author: Ag

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C = (2, 2)
A = (0, 0)
B = (4, 0)
c = Segment(A, B)
a = Segment(C, B)
b = Segment(A, C)
D = Point(c)
d = Segment(C, D)
D' = Rotate(D, 90.0, C)
q = Segment(D, A)
p = Segment(D, B)