71. The Law of Cosines

The Law of Cosines
URL: http://www.cut-the-knot.org/Curriculum/Geometry/CosineLawUnfolded.shtml - 22kb - 19 Jun 2006

72. Circles and Reflections in a Triangle

Circles and Reflections in a Triangle: reflect an arbitrary point in the sides of a triangle. Combining pairs of the reflections with vertices of the triangle generates three circles. The three circles concur on the circumcircle of the triangle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TriangleReflection.shtml - 22kb - 19 Jun 2006

73. Tangency Point of Two Circles

Tangency Point of Two Circles
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TangentToTwoCircles.shtml - 22kb - 19 Jun 2006

74. Two Homotheties in a Parallelogram

Two Homotheties in a Parallelogram
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TwoHomothetiesInPara.shtml - 22kb - 19 Jun 2006

75. Isogonal image of the circumcircle. What is it?

Isogonal image of the circumcircle. What is it? The line at infinity.
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Circumsogonal.shtml - 22kb - 19 Jun 2006

76. Ceva and Menelaus Theorems for Angle Bisectors

Ceva and Menelaus Theorems for Angle Bisectors: various combinations of internal and external angle bisectors in a given triangle lead to some concurrencies and colinearities
URL: http://www.cut-the-knot.org/Curriculum/Geometry/MenelausBisector.shtml - 22kb - 19 Jun 2006

77. Square Inscribed in Triangle

Square Inscribed in Triangle: construct a square inscribed into a given triangle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/InscribedSquare.shtml - 22kb - 19 Jun 2006

78. Directly Similar Figures

Sites for teachers Sites for parents Terms of use Awards Interactive Activities CTK Exchange Games & Puzzles Arithmetic/Algebra Geometry Probability...
URL: http://www.cut-the-knot.org/Curriculum/Geometry/DirectlySimilar2.shtml - 23kb - 19 Jun 2006

79. Equidecomposition of Two Parallelograms

Equidecomposition of Two Parallelograms with equal bases and areas
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TwoParallelograms.shtml - 23kb - 19 Jun 2006

80. Varignon Parallelogram

Varignon Parallelogram
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Varignon.shtml - 23kb - 19 Jun 2006

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