Euclidś Elements, Books 16; Book 11 
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Review: Euclid's Elements
User Review  Dale Bryant  GoodreadsOne of the recommend "great" books. Read full review
Review: Euclid's Elements
User Review  Jace Davies  GoodreadsSave this one for after you've surveyed both geometry and logic in formal study. Its ideas are, frankly, transcendent. I would wager that no work of art has inspired delight so consistently through the ages as the Elements. Plane geometry is poetry for the higher orders of the mind. Read full review
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ABCD adjacent angles angle ABC angle ACB angle BAC angle DEF angle EDF angles equal Axiom base BC BC is equal bisected centre circle ABC circumference Constr Construction Definition 15 demonstration double draw equal angles equal to F equiangular equilateral and equiangular equimultiples Euclid Euclid's Elements exterior angle fourth given circle given straight line gnomon greater ratio Hypothesis less Let ABC Let the straight meet multiple opposite angle parallel to BC parallelogram perpendicular point F polygon produced proportionals PROPOSITION 13 q.e.d. PROPOSITION rectangle contained remaining angle right angles segment shown sides similar and similarly Simson square described square on AC straight line &c THEOREM touches the circle triangle ABC triangle DEF twice the rectangle Wherefore