A semicircular region of water within 1 mile of a point O on shore is restricted. Two warning lights A and B are placed at 1 mile away on either side of O on shore. Describe a simple method of sighting that could be used by a ship S to stay out of the restricted area.
2026-04-11 05:27:21.1775885241
Geometric circle application
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1
As long as the angle $\angle ASB$ is less than $ 90$ degrees the ship is outside the restricted area.
The angle passes through $90$ degrees as it enters the restricted region.
Inside the region the angle is larger than $90$ degrees.