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Element 20. The Circumcenter | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 19. Symmetries and Scaling of the Unit Circle | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 30. The Midsegment | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 61. The Euler Circle (The Nine-Point Circle) | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 38. Circumscribed Quadrilaterals | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 50. The Trident Lemma | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 96. Casey's Theorem | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 65. Ceva's Theorem | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 46. Spiral Similarity | Elements in Geometry for Olympiads (OptionalProblem) View |
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Element 4. Sum of angles in a triangle | Elements in Geometry for Olympiads (OptionalProblem) View |