QA-P21: Reflection of QA-P16 in QA-P1


QA-P21 is the Reflection of QA-P16 (QA-Harmonic Center) in QA-P1 (QA-Centroid) as well as the Midpoint of QA-P5 (Isotomic Center) and QA-P19 (AntiComplement of QA-P16 wrt QA-DT).
QA-P21-00
                       
Coordinates:  
1st CT-coordinate:
            (2 p + q + r) (q2 + q r + r2)
 
1st DT-coordinate:
            -p2 (2 (-p4 + q4 + r4) + (-p2 + q2 + r2)2)
 
Properties:
  • QA-P21 lies on these QA-lines:
        QA-P1.QA-P16          (-1 : 2 => QA-P21 is Reflection QA-P16 in QA-P1)
        QA-P5.QA-P17
        QA-P20.QA-P31        (2 : -1 => QA-P21 is Reflection QA-P20 in QA-P31)