You would count each square and multiply it by 18. It is like that because they are cubes. There are 16 full cubes. 16x18=288. Those 2 triangles would be a full square. It would equal 18. 288+18=306. But now you square it which would equal 612. A.K.A
D. I could be wrong. I'm sorry if I am, but please tell me.
