Crossed Quadrilateral Properties

This interactive sketch shows 3 sketches showing that the interior angle sum of a crossed quadrilateral is 720, and that for a crossed cyclic quadrilateral the opposite angles are 360, while the area relationship of Varignon's theorem is maintained when a quadrilateral is dragged into the shape of a crossed quadrilateral.

Visit: http://dynamicmathematicslearn…d_anglesum.html

Michael

 
Material Type
Activity
Tags
of  area  angle  theorem  interior  quadrilateral  varignon  crossed  sum-of-angles 
Target Group (Age)
14 – 18
Language
English (United Kingdom)
 
 
Views
3147
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