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和角公式tan(圖解)
Author:
陳柄何
GeoGebra
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盈利與虧蝕
常见四边形是否是双心四边形
双心四边形
科赫雪花
活动三:应用性质
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圓形,三角形軌跡觀察
斯霍滕(Schooten)定理(與角平分線定理等價)
Angles in a Circle:Property 3
相反数 探究 (教材第9页)
两个等腰三角形
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