Locus of Points with Constant Angle
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This Demonstration plots the points for which line segments drawn from two fixed points on the 
axis have angle 
. The locus consists of the arcs of two circles, with centers that move along the 
axis as you vary 
. For 
, the arcs are semicircles and the locus is a circle.
Contributed by: Mark Rosno (December 2012)
Open content licensed under CC BY-NC-SA
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"Locus of Points with Constant Angle"
http://demonstrations.wolfram.com/LocusOfPointsWithConstantAngle/
Wolfram Demonstrations Project
Published: December 3 2012
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