Pand Q r any 2 points lying on the sides dc and ad respectively of a parallelogram ABCDshow that arAPB=ar BQC
If your question is "Pand Q r any 2 points lying on the sides BC and AD respectively of a parallelogram ABCD show that arAPB=ar BQC" than the solution is
Since ABCD is a parallelogram.
AD = BC
Let CL be the altitude
This also proves that the area of triangle between the two parallel lines and same bases are equal.