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Jenny    3

This is in the Home Instructor's Guide, correct?

The idea is that you can find the area of the shaded triangle by using the area of the larger triangle, with base 10 and height AD and subtract area of the smaller triangle ad height up to bottom of that interval marked F. Since these two have the same base, then all you need to do is subtract their heights, and multiply that difference by the base x 1/2 to get the shaded area. The difference in heights of the two is 11 cm. 

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