Question

"An office building is in the shape of a right rectangular prism wit height 200m, length 60m and width 40m. The top quarter of each vertical face of the building is to be covered with a large banner. What is the total surface area to be covered with banners?"
I don't know what they mean by "top quarter of each vertical face" and therefore don't know where to start. I have sketched the triangle and its dimensions.
If it is a rectangular prism, why would you sketch a triangle?

First, find the perimeter, 2L + 2W. Then multiply by 200/4, "the top quarter of each vertical face."

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