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Casey's angle 2

Author:
Maurice OReilly
Topic:
Angles, Circle, Geometry
This applet shows Casey's angle using projection from a point - as opposed to parallel projection. Here again, Casey's angle is shown to be perspective invariant: BOC = B'O'C' 13 points are shown here, 7 large and 6 small. Move the seven large ones as you will to explore Casey's angle. How can you accurately describe what you observe?

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