171. Equilateral Triangles On Sides of a Parallelogram

Equilateral Triangles On Sides of a Parallelogram: two step Napoleon's triangle construction convert between two parallelograms
URL: http://www.cut-the-knot.org/Curriculum/Geometry/EquiTriOnPara.shtml - 24kb - 19 Jun 2006

172. Three Similar Triangles

Three Similar Triangles: a curious collinearity
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ThreeSimilarTriangles.shtml - 24kb - 19 Jun 2006

173. Triangle Sliding on Two Straight Lines

Triangle Sliding on Two Straight Lines
URL: http://www.cut-the-knot.org/Curriculum/Geometry/StraightLinesInCircle.shtml - 24kb - 19 Jun 2006

174. The Fundamental Theorem of 3-Bar Motion

The Fundamental Theorem of 3-Bar Motion: What is it?
URL: http://www.cut-the-knot.org/Curriculum/Geometry/3BarMotion.shtml - 24kb - 19 Jun 2006

175. Two Colors in Two Rows

Two Colors in Two Rows: there are as many pairs of one color as of the other
URL: http://www.cut-the-knot.org/Curriculum/Algebra/ItemParity.shtml - 24kb - 19 Jun 2006

176. Common Tangents to Two Circles

Common Tangents to Two Circles: simultaneously inflating and deflating the circles
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TangentTwoCirclesI.shtml - 24kb - 19 Jun 2006

177. The Carpets Theorem With Parallelograms

Carpets Theorem With Parallelograms
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ParaInParaCarpet.shtml - 24kb - 19 Jun 2006

178. Two quadrilaterals

Two quadrilaterals. The opposite sides of the quadrilateral formed by points of tangency of a curcumscribed quadrilateral meet on the diagonals of the latter
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TwoQuadris.shtml - 24kb - 19 Jun 2006

179. Apollonius Problem

Apollonius Problem
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ApolloniusSolution.shtml - 25kb - 19 Jun 2006

180. Simsons and 9-Point Circles in Cyclic Quadrilateral

Four simsons and four 9-Point Circles are concurrent in a cyclic quadrilateral
URL: http://www.cut-the-knot.org/Curriculum/Geometry/FourSimsons.shtml - 25kb - 19 Jun 2006

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