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S = the semicircle of radius 1 and center (1,0) having nonnegative y coordinates.
C = the circle of radius r and center (0,0)
Y = the highest point on C
A = the intersection of C and S
X = the x-intercept of the line through Y and A
What is the locus of midpoints of the line segment YX for
0 r 2?
Source: Stan Wagon.© Copyright 2000 Stan Wagon. Reproduced with permission.
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