181. A Tangent in Concurrency

A Tangent in Concurrency
URL: http://www.cut-the-knot.org/Curriculum/Geometry/From500.shtml - 25kb - 19 Jun 2006

182. Three Similar Triangles

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/SimilarTriangles.shtml - 25kb - 19 Jun 2006

183. On Bottema's Shoulders

On Bottema's Shoulders
URL: http://www.cut-the-knot.org/Curriculum/Geometry/McWorter.shtml - 25kb - 19 Jun 2006

184. Circle of Similitude

Circle of Similitude
URL: http://www.cut-the-knot.org/Curriculum/Geometry/CircleOfSimilitude.shtml - 25kb - 19 Jun 2006

185. Six Circles Theorem (Elkies)

Six Circles Theorem: a chain of incircles defined by a Cevian.
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Elkies.shtml - 25kb - 19 Jun 2006

186. Concurrency in Arbelos

Concurrency in Arbelos
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ArbelosIncircle.shtml - 25kb - 19 Jun 2006

187. A Problem of Hinged Squares

A Problem of Hinged Squares: four points on a pair of hinged squares always form another square (Finsler-Hadwiger theorem)
URL: http://www.cut-the-knot.org/Curriculum/Geometry/SqFromSq.shtml - 25kb - 19 Jun 2006

188. Inscribed and Central Angles in a Circle

Inscribed and Central Angles in a Circle: inscribed angle is half of the associated central angle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/InscribedAngle.shtml - 25kb - 19 Jun 2006

189. Three Isosceles Triangles

Three Isosceles Triangles: a curious collinearity
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ThreeIsoscelesTriangles.shtml - 25kb - 19 Jun 2006

190. Brahmagupta's Theorem

Brahmagupta's Theorem: In a cyclic quadrilateral having perpendicular diagonals, the perpendicular to a side from the point of intersection of the diagonals always bisects the opposite side.
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Brahmagupta.shtml - 25kb - 19 Jun 2006

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