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hermoni
GeoGebra
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Building Trapezoids with Set Areas
bewijs stelling van Pythagoras
Building Triangles with Set Areas
Fourier Lissajous (Mechanical)
Rolling an Equilateral Triangle
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Riemann Sums rectangles
Patrick Kane's Points
Opp. angles, cyclic quad.
TriangleCircumcenter
gauss law application 3
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