211. Incenters in Cyclic Quadrilateral

Incenters in Cyclic Quadrilateral: according to a Japanese theorem the four incenters in a cyclic quadrilateral form a rectangle
URL: http://www.cut-the-knot.org/Curriculum/Geometry/CyclicQuadrilateral.shtml - 26kb - 19 Jun 2006

212. 3 Isosceles Trapezoids

3 Isosceles Trapezoids
URL: http://www.cut-the-knot.org/Curriculum/Geometry/TwoTrapezoidsSolution.shtml - 26kb - 19 Jun 2006

213. Concyclic Points in Arbelos

Concyclic Points in Arbelos
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ArbelosConcyclic.shtml - 26kb - 19 Jun 2006

214. Nagel Point of the Medial Triangle

Nagel Point of the Medial Triangle: strangely, could be defined in several ways
URL: http://www.cut-the-knot.org/Curriculum/Geometry/MedialNagel.shtml - 26kb - 19 Jun 2006

215. Four Touching Circles

Four Touching Circles: In a chain of pairwaise touching circles, the four tangency points are concyclic
URL: http://www.cut-the-knot.org/Curriculum/Geometry/FourTouchingCircles.shtml - 26kb - 19 Jun 2006

216. Inversion with Negative Power

Inversion with Negative Power
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Inversion2.shtml - 26kb - 19 Jun 2006

217. Rectangle in Arbelos

Rectangle in Arbelos
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ArbelosRect.shtml - 26kb - 19 Jun 2006

218. Four Concurrent Lines in a Cyclic Quadrilateral

Four maltitudes in a cyclic quadrilateral are concurrent at the anticenter of the quadrilateral
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Brahmagupta2.shtml - 26kb - 19 Jun 2006

219. Three Concurrent Circles

Three Concurrent Circles
URL: http://www.cut-the-knot.org/Curriculum/Geometry/ThreeConcurrentCircles.shtml - 26kb - 19 Jun 2006

220. Nobbs' Points, Gergonne Line

Nobbs' Points, Gergonne Line
URL: http://www.cut-the-knot.org/Curriculum/Geometry/Nobbs.shtml - 26kb - 19 Jun 2006

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