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Euclid's Elements, Book I: Units 1–3
Try the first three units of our Euclid course, exactly as enrolled students see them: Euclid's own text in T. L. Heath's translation, an AI tutor that asks questions rather than handing out answers, and a short mastery check for each unit.
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Units
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In this unit you will
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Check your mastery
Answer each question in your own words. When every answer is marked correct, the unit is mastered. In the sample, your progress is kept only in this browser.
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Units 4–14 (the propositions, through the theorem of Pythagoras) are part of the full course. The full course is for enrolled students. Apply here (free).