Review 2.2, 2.5, 3.5, 4.1, 5.7 #21

B. Lamm in Mr. Kirkland's Math II Class

A surveyor needs to measure the distance, AB, across the lake. Beginning at E, he locates the midpoint, C, of segment AE and the midpoint, D, of segment BE. He then measures segment CD. What is AB?

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