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GeoGebra after Kees Visser. First step: http://tube.geogebra.org/material/show/id/807495 What does this do to the fractions illustrated? Why does matching opposite vertices fill in 100%? What is the boundary curve in that case?

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Perimeter and Area of a Rectangle
GoGeometry Action 15!
Si Yantra 112
Ultimate symmetry in cone-sphere sys.
Construction-Perpendicular Line

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