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Perspector |
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Triangles  ABC
and
A1B1C1
are perspective triangles if one of the following six
triples of lines concur in a point:AA1, BB1, CC1, AB1, BC1, CA1, AC1, BA1, CB1, AA1, BC1, CB1, AC1, BB1, CA1, AB1, BA1, CC1. The point of concurrence P is called a prespector (replacing center of perspective). 
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