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

### J. Batchelor in Mr. Kirkland's Math II Honors Class

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

Once you complete this step and understand what you need to do, it's time to multiply.

Since CD is 61, just multiply it times two and you get that the lake is 122m across.