Hey guys! I will not be too long in pre-explanations - my cousin has big problem with math, however, i could not help him with this one. Hope you will.
Task. Given parallelogram's PRST three points R, S, T:
a) Calculate coordinates of a point P and construct parallelogram;
b) Write an equation of diagonal PS;
c) Calculate angle between diagonal PS and ST;
d) Write an equation for a line, which goes through centre of parallelogram and perpendicular to PS.
If you guys could also tell me what theory you used, that would be very much appreciated because i want to learn, not just get an answer. BIG BIG thanks!