Mathematics

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Similar triangles at the ancient lighthouse at Alexandria.

Illustration of a lighthouse projecting a beam towards a ship at sea, demonstrating trigonometric concepts such as angle of elevation, distance from the lighthouse to the ship, and the height of the lighthouse.

This illustration demonstrates the application of trigonometry to calculate distances and angles involving a lighthouse, a ship, and the line of sight. The diagram, suitable for trigonometry textbooks, shows how to use angle measurements and triangle properties to find the height and distance relationships.

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