O is any point on the diagonals BD of the parallelogram ABCD . Prove that ar(∆OAB)=ar(∆OBC)

O is any point on the diagonals BD of the parallelogram ABCD . Prove that ar( $∆ O A B$ )=ar( $∆ O B C$ )

Matching exercise

Match the items on the right to the items on the left.

step 1

step 2

step 3