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Author:David Backer

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Perimeter of Rectangle
bewijs stelling van Pythagoras
Mondrian's Puzzle
z`]]
Area of a Circle Illustrated

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Centres of a Triangle and the Euler Line
Distance between two points
Tessellation #1 Part 2
Workspace for Polygons
Equation of a horizontal line

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Geometry
Cone
Logic
General Quadrilateral
Congruence

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