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120 degrees

Author:421322

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bewijs stelling van Pythagoras
Classifying Triangles
Sum of Squares: Proof without Words
The Gardener's Ellipse
Regular Polygons and Equivalent Triangles

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Inequality sum of radii of excircles
Quadrilateral proofs
hiperbolas
Minima Maxima Problem

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Linear Programming or Linear Optimization
Ellipse
Circle
Right Triangles
Combinatorics

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