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sangaku
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GeoGebra
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Ellipse, Hyperbola and Circle as Envelopes
History of Maths
Play C3 E3 G3 C4_C4
Introduction
Ellipse as Envelope - Correspondence Method
Discover Resources
Area of Rectangles and Squares
#1) The three excircles of triangle ABC will be tangent to the (non-extended) sides at three points.
Aleksandr Ostapjuk
Median triangles
Parallel lines - 2
Discover Topics
Rectangle
Quadrilaterals
Equations
Orthocenter
Intersection