Question

P and Q are any two points lying on the sides DC and AD respectively of a parallelogram ABCD.show that ar (APB) = ar (BQC).

Answer 1

given: ABCD is a parallelogram . P and Q are any points on the sides DC and AD respectively.

TPT: area(ΔAPB) = area(ΔBQC)

proof;

if a triangle and a parallelogram are on the same base and between same set of parallel lines. the area of the triangle is half the area of the parallelogram.

ΔAPB and parallelogram ABCD are on the same base AB and between same parallels AB and CD.

therefore area(ΔAPB)= 1/2 area(ABCD)..............(1)

similarly

triangle BQC and parallelogram ABCD are on the same base BC and between same parallels AD and BC.

area(ΔBQC)=1/2 area(ABCD).......................(2)

from (1) and (2): area(ΔAPB) = area(ΔBQC)

which is the required result.

hope this helps you.