PQ3-PQ1-line crossing P1-P2-line at ...
PQ3-1-P1-2
29.971615403999035, 31.125965864949
31,125965864949 29,971615403999035
https://goo.gl/maps/tDzpy7eirJWVjZz39
Angle between PQ3-PQ1-line and P1-P2-line:
90,339 - 43,352 = 46,987 angle-360-system