If ABCD is a parallelogram , then prove that : ar(ABD) = ar (BCD) = ar(ABC) = ar(ACD) = 1/2 ar(ABCD). Share with your friends Share 1 Varun.Rawat answered this Kindly refer the following link :https://www.meritnation.com/ask-answer/question/if-abcd-is-a-parallelogram-prove-thatar-abd-ar-bcd/areas-of-parallelograms-and-triangles/3074861 -1 View Full Answer Divyanshu Singh answered this A diagonal divides a Parallelogram into 2 triangles of equal areaHence, ar(ABD) = ar(BCD) = ar(ACD) = 1/2 ar(ABCD). 2