parametrics equation Q (1 Viewer)

[ToO LaZy ^*]

i can find the equations of the 2 lines and where they intersect
but what do you actually need to show in order the prove they bisect each other?

EDIT: ooops..forgot to load the question..

 

[CM_Tutor]

Show that PR and QS have the same midpoint, which is easily shown to be (at, 0), in this case.

 

[ToO LaZy ^*]

oh! is that it!.?..ohk cool