[b]Proposition:[/b]
[i]Given two known inaccessible points A and B, to determine the location of two accessible unknown points P and P' from bearings on A and B.[/i]
Example: I am on a ship at sea and I take bearings from two familiar points on land. If I maintain a straight line course and take bearings twice I can determine my heading and the locations where the bearings were taken.
This is problem #40 in Heinrich Dorrie's [i]100 Great Problems of Elementary Mathematics[/i]
(The solution is my own.)
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