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11-7.

In the diagram below, and  are similar. If , , and , then what is ?
Triangle A, D, E. A line B, C is drawn horizontally inside the triangle to form a triangle inside A, B, C.

Separate the triangles into two similar triangles.

What is the length of ? Once you know this, since the triangles are similar, the ratios of corresponding sides are equal.
Remember to set up proportions.

units