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判定三角形全等的条件（AAA？）
Author:
孙敏捷
GeoGebra
New Resources
常见四边形是否是双心四边形
盈利與虧蝕
撒针估算面积实验
活动三：应用性质
龙形曲线-分形龙2
Discover Resources
任務1
task2
把手(環面)
Geometry : Types of Angles (幾何：角的種類)
∆ABD 面積 = ?
Discover Topics
Histogram
Conic Sections
Reflection
Sine
Symmetry