QA-P7:  QA-Nine-point Center Homothetic Center


The QA-Nine-point Homothetic Center (QA-P7) is the homothetic center of the Reference Quadrangle with the Quadrangle composed of four 2nd  generation Nine-point Centers (point X(5) in ETC [12]).

1st CT-Coordinate:

a4 q r/p + 3 p S2 + q SB2 + r SC2 + (p + q + r) (3 S2 + 2 SB SC)

1st DT-Coordinate:

-(3 S2 – SA2) p4 + (3 S2 + SA SB + SB c2) p2 q2 + (3 S2 + SA SC + SC b2) p2 r2 – a4 q2 r2

Properties:



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