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Euclidean geometry is a mathematical system attributed to the Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the Elements. Euclid's method consists in assuming a small set of intuitively appealing axioms, and deducing many other propositions (theorems) from these.

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How to solve geometry problems using involutions

My advise is Theory and Problems of Projective Geometry in the Schaum's Outline Series, written by Frank Ayres. It is indeed a very nice method of solving problems in geometry.
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