Problem Statement:

Find the height of a lamp post if the angle of elevation of its top changes from 20 degrees to 40 degrees as the observer 1.8 meters tall advances 23 meters toward the base.

A. 15.68

B. 18.65

C. 16.58

D. 19.48
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Please watch: "Solution: Find the length of the journey of the train | EE Board April 1997"
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