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Calculating the distance of a ship from the shore

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From the point of the shore which
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Calculating a long distance from a ship (or island) to the shore

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From the point of the shore which
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Calculating the circumference of the Earth

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When Eratosthenes was informed that on the
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Calculating the height of the Pyramid (of Cheops)

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Thales of Miletus, with his astronomical knowledge,
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Measuring the height of an object with a stick

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Be it a tree of which we
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Calculating the height of an inaccessible object

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Be it that for the need of
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