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等角对等边（等边对等角）
Author:
夜雨嘀嗒
Topic:
Triangles
GeoGebra
New Resources
撒针估算面积实验
活动三：应用性质
斐波那契螺旋弧线（表格法）
比較五件物件的重量
折扣
Discover Resources
大樂透開獎機
內心
面鏡的反射
二次函数问题
加减法练习
Discover Topics
Limits
Inequalities
Angles
Derivative
Trapezoid