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Angle In Semicircle
作者：
Jon
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圓
GeoGebra
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Portions of a Sphere
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bewijs stelling van Pythagoras
Folding door
Proving Triangles Similar: Multistep Transformations
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Path integral for planar curves
Power of Irrational numbers
tretretretretre
Perpendicular Bisector
Circumcenter and Incenter
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