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US Edition 6A Textbook, Review E, pg. 91, # 40.

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There are essentially 3 triangles. A large one which is composed of two smaller ones, one of which is shaded and one which is not.

You have the height of the large one, and the height of the unshaded one. They both have the same base.

So, subtract the area of the unshaded one from the area of the large one.

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