121. Projective Collinearity in a Quadrilateral

Projective Collinearity in a Quadrilateral
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ProjectiveQuadri.shtml - 23kb - 19 Jun 2006

122. Dividing a Segment into N parts: Besteman's Construction II

Dividing a Segment into N parts: Besteman's Construction II
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Besteman2.shtml - 23kb - 19 Jun 2006

123. Square From Nowhere

Square From Nowhere
URL: http://www.cut-the-knot.org/Curriculum/Geometry/FunnySquare.shtml - 23kb - 19 Jun 2006

124. Property of Angle Bisectors

Property of Angle Bisectors
URL: http://www.cut-the-knot.org/Curriculum/Geometry/AngleBisectorRatio2.shtml - 23kb - 19 Jun 2006

125. Four Equal Incident Circles

Four Equal Incident Circles: Four tangents to successive incident circles of equal radius form a cyclic quadrilateral
URL: http://www.cut-the-knot.org/Curriculum/Geometry/FourIncidentCircles.shtml - 23kb - 19 Jun 2006

126. Heron's Problem

Heron's Problem: Two points lie on the same side of a straight line. On the latter, find a point for which the sum of distances to the two given points is minimal
URL: http://www.cut-the-knot.org/Curriculum/Geometry/HeronsProblem.shtml - 23kb - 19 Jun 2006

127. The Mirror Property of Altitudes

The Mirror Property of Altitudes
URL: http://www.cut-the-knot.org/Curriculum/Geometry/AltitudeMirror.shtml - 23kb - 19 Jun 2006

128. Simson Line

Simson Line: feet of the perpendiculars from a point to the sides of a triangle are collinear iff the point lies on the circumcircle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Simpson.shtml - 23kb - 19 Jun 2006

129. La Hire's Theorem

La Hire's Theorem
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ThreePolars.shtml - 23kb - 19 Jun 2006

130. Construction of Parahexagon

Construction of Parahexagon: in any hexagon, three consecutive vertices form a triangle. Centers of these triangles form a parahexagon.
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Parahexagon.shtml - 24kb - 19 Jun 2006

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