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The Pythagorean Curiosity |

Problem
103.Equilateral Triangle Area,
Interior Point, Heron's Formula. |
Triangle and Squares Theorem 1:
with Interactive Geometry Software |

Problem
102.Equilateral Triangle Area,
Interior Point

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Complete Quadrilateral: Ortholine-Steiner Line |

Problem
97. Similar Triangles, Areas. |

Problem
97. Similar Triangles, Areas. |

Problem 96. Similar Triangles, Incenters,
Parallelogram

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Complete Quadrilateral: Ortholine-Steiner Line |

Problem
95. Similar Triangles, Inradii,
Parallel.. |

Problem
94. Similar Triangles, Circumcircles,
Circumradii. |

Problem 93. Similar Triangles, Circumcircles, Parallelogram.

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Gergonne's Theorem: Triangle and Concurrent Cevians
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Problem 90. Quadrilateral and Triangle
Areas, Midpoints |

Problem 89. Triangles of equal area, Midpoints |

Problem 87. Quadrilaterals and
Midpoints of Diagonals

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Intouch and Extouch
Triangles, Areas
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Contact Triangles Areas, Incircle, Excircle |

Contact Triangles Areas, Incircle, Excircle, Inradius, Exradius |

Area of the Contact Triangle, inradius, circumradius

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English version
Spanish version |

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Mascheroni
Construction with compass alone. |

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Right
Triangles, Formulas and Facts
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Mind Map of
the Pythagorean Theorem
Proofs by shears, translation, similarity. Facts. |

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Triangle and Squares 20
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