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This theorem makes it possible to calculate ratios of lenght and to highlight relations of proportionality in the presence of parallelism
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Geometry theorem that relates the lengths of the sides in a right triangle
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He conquered Syria, Egypt and founded Alexandria
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He lays the foundations of geometry and establishes the model of scientific rigor
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He proposed the first heliocentric model of the solar system
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He offers a calculation to measure the perimeter of the Earth
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He elaborates the first astronomical catalog with 650 stars
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He introduces a lot of important notion in the field of medicine and pharmacy