The dynamic geometry figure below shows a circle O with M midpoint of a chord AB. Chords CD and EF pass through M. Chords CF and DE intersect AB at G and H, respectively. Prove that M is the midpoint of GH.
This step-by-step interactive illustration was created with GeoGebra.
GeoGebra is free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus application, intended for teachers and students. Many parts of GeoGebra have been ported to HTML5.
Ten problems: 1411-1420
HTML5 and Dynamic Geometry
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