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Slopes of Parallel and Perpendicular Lines
Author:
tinhel
Use this applet to discover the properties of slopes of parallel and perpendicular lines!
GeoGebra
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Shade a spheric triangle with "surface".
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探究由平行線和截線所成的角
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Arnoldo Munoz Quadrilateral #6
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Quadrilaterals
Geometric Mean
Parallelogram
Geometry
Inequalities