ABCD is a rectangle and BD is 1 of its diagonals. If ar (triangleABD) =8 cm2,findar (triangleBCD). Share with your friends Share 1 Varun.Rawat answered this We have,ABCD as the given rectangle in which BD is one of its diagonal.Now, we know that every rectangle is a parallelogram.Also, diagonal of a parallelogram divides it into 2 congruent ∆'s of equal areas.So, ar∆BCD = ar∆ABD⇒ar∆BCD = 8 cm2 2 View Full Answer