Answer:
Step-by-step explanation:
You should use the formula of a triangle which is bh/2 and compare this formula to the formula of a parallelogram bh what do you see. Ask yourself the question of why are we dividing the area of a triangle by 2 and why are we not for the area of a parallelogram? And what makes up the parallelogram DBD'C? It helps if you draw it out.
