5L-s-P10: 5L-QL-P29 Par1/Per2-Homothetic Center

5L-s-P10 is the Par1/Per2-Homothetic Center (see nL-n-Luc5g) of QL-P29 wrt the Reference 5-Line.
There is an interesting relationship with 5L-n-P14 (Par1/Par2-Homothetic Center of QL-P29).
 
5L n P14 HC QLP29 points 03

Properties:
5L-s-P10 = 5L-n-P5.5L-n-P7 (-1:2)