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二面角的平面角

Author:: 杜耀宗

研究二面角的平面角内含自制工具，可以为正反面设置不同的颜色

GeoGebra Applet

三个自制工具

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Penrose Triangle 2
trigonometric function
王二星际太阳能旅行车
penrose triangle
三垂線定理

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柱體建築師
國旗
hkdse 2014 by mr lo wy
工具：PlaneText, PlaneArrow
双曲线

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Arithmetic Operations
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