Cover of Euclids elements of geometry

Euclids elements of geometry

by Euclid

539 pages•about 11 h 15 min to read•Public domain

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About this book

Euclid’s Elements is a systematic geometry textbook that teaches mathematical reasoning through propositions and proofs. In an early demonstration, a line drawn parallel to a triangle’s side helps establish that its angles add up to two right angles. Later sections apply the same deductive method to angles formed by circles and to ratios between areas, with exercises that ask readers to continue the reasoning. Its step-by-step structure makes the book a course in proving geometric claims, not simply a collection of results.

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