41. Siamese Triangles

Siamese Triangles: a theorem for a couple of triangles that share a side and a baseline. A Mathematical Droodle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Siamese1.shtml - 23kb - 19 Jun 2006

42. Miquel's Point

Miquel's Point. Mathematical Droodle: What is this?
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Miquel.shtml - 23kb - 19 Jun 2006

43. Siamese Triangles II

Siamese Triangles II: a theorem for a couple of triangles that share a side and a baseline. A Mathematical Droodle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Siamese2.shtml - 24kb - 19 Jun 2006

44. A problem with equilateral triangles

A problem with equilateral triangles
URL: http://www.cut-the-knot.org/Curriculum/Geometry/EquilateralTrianglesSolution.shtml - 24kb - 19 Jun 2006

45. Two Triples of Similar Triangles

Two Triples of Similar Triangles. Mathematical Droodle: What is this about?
URL: http://www.cut-the-knot.org/Curriculum/Geometry/SimTri.shtml - 25kb - 19 Jun 2006

46. Point common to two similar rectangles

Point common to two similar rectangles. Mathematical Droodle: What is this about?
URL: http://www.cut-the-knot.org/Curriculum/Geometry/SimRect.shtml - 26kb - 19 Jun 2006

47. Sperner's Lemma

Sperner's Lemma: counting the number of complete triangles in a triangulation
URL: http://www.cut-the-knot.org/Curriculum/Geometry/SpernerLemma.shtml - 20kb - 19 Jun 2006

48. Pappus' Theorem

Pappus' Theorem
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Pappus.shtml - 20kb - 19 Jun 2006

49. 5-Star and A Circle

5-Star and A Circle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/StarAndCircle.shtml - 20kb - 19 Jun 2006

50. Shapes of constant width

Shapes of constant width, definition, animation, discussion, there are Shapes of constant width other than the circle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ShapeOfConstantWidth.shtml - 20kb - 19 Jun 2006

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