Question

A surveyor needs to measure the distance, AB, across the lake.

D. of BE He then measures CD. What is AB?
Beginning at E, he locates the midpoint, C, of AE and the midpoint,

Answer 1

Explanation:

This does seem impossible, but, that the segment CD happens to be exactly in the middle from point E to segment AB. so we can use a special formula

2* CD = AB

we are given CD = 78

so the AB = 2*78 = 156 m

Answer 2

The steps are attached to image