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trapezoid with 2 fixed vertices
作者：
Marina Sinitsky
主題：
梯形
GeoGebra
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Viviani's Curve
Slope and Road Signs
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Cartesian vs Polar
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Jack -- edit this graph
quiz 2 Q.12
Geometry Concepts
Exterior angles of polygon -- numeric
Avoidance opt.A: translation, lrf
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