A = Point(xAxis)
B: (0, 12)
c = Circle(A, B)
C: (0, 9)
f = Segment(B, C)
g = Segment(C, A)
h = OrthogonalLine(C, g)
D = Intersect(c, h, 2)
E = Intersect(c, h, 1)
d = CircleSector(A, D, E)
kuvio1, e, a, d_1 = Polygon(A, D, E)