141. Wittenbauer's Parallelogram

Wittenbauer's Parallelogram and Theorem
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Wittenbauer.shtml - 24kb - 19 Jun 2006

142. Nagel Point

Nagel Point: the lines joining vertices of a triangle with the points of tangency of the opposite excircles and sides meet in the Nagel point
URL: http://www.cut-the-knot.org/Curriculum/Geometry/NagelPoint.shtml - 24kb - 19 Jun 2006

143. Medians in a Quadrilateral

Medians in a Quadrilateral: the three medians of any quadrilateral concur in a point.
URL: http://www.cut-the-knot.org/Curriculum/Geometry/AnyQuadri.shtml - 24kb - 19 Jun 2006

144. An Anticomplementary Triangle Surprise

An Anticomplementary Triangle Surprise: two step Napoleon's triangle construction yields the anticomplementary triangle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/AnticomplementaryTriangleSolution.shtml - 24kb - 19 Jun 2006

145. Hiroshi Haruki's Lemma

Hiroshi Haruki's Lemma
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Haruki.shtml - 24kb - 19 Jun 2006

146. Squares on Sides of a Quadrilateral

Squares on Sides of a Quadrilateral: Segments joining the centers of the opposite squares are equal and perpendicular
URL: http://www.cut-the-knot.org/Curriculum/Geometry/SqOnQuadri.shtml - 24kb - 19 Jun 2006

147. Six Incircles in an Equilateral Triangle

Six Incircles in an Equilateral Triangle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/SixIncircles.shtml - 24kb - 19 Jun 2006

148. La Hire's Theorem

La Hire's Theorem
URL: http://www.cut-the-knot.org/pythagoras/LaHire.shtml - 24kb - 19 Jun 2006

149. Symmedian and the Tangents

Symmedian and the Tangents: Symmedian through one of the vertices of a triangle passes through the point of intersection of the tangents to the circumcircle at the other two vertices
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Symmedian.shtml - 24kb - 19 Jun 2006

150. Symmedian and 2 Antiparallels

Symmedian and 2 Antiparallels: Antiparallels that meet on a symmedian are equal
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Sym2Antiparallel.shtml - 24kb - 19 Jun 2006

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