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gjc090a23 園內三角形與角度
Author:
謝定原
GeoGebra
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判斷球體
兩組對邊相等的四邊形
Nested spiral octagon
美國國旗 (Codex 版)
四邊形的特性
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分數加法
五角錐體
sinα + sinβ > 0 ?
龜甲
两圆的位置关系
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Quadrilaterals
Linear Functions
Geometric Transformations
Geometric Mean
Geometry