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Christmas Tree
Author:
陳隆期
GeoGebra
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兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
球体的体积推导（优化版）
【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
Discover Resources
Apollonius Problem 10 CCC wiki step 2
test geoebra1
外接圓的心
圓例2
两角差的余弦公式的证明
Discover Topics
Rotation
Continuity
Expected Value
Ellipse
Quadrilaterals