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海岛算经
Author:
Dai xuan
GeoGebra
New Resources
撒针估算面积实验
第八周作业2
活动三：应用性质
双心四边形
常见四边形是否是双心四边形
Discover Resources
regular tetrahedron in a cube
Direct and Inverse Variation 正變與反變
How to draw an octagon with ruler and compasses?
三視圖3d眼鏡
定理介紹：切線性質 | Tangent Properties
Discover Topics
Inequalities
Similar Triangles
Complex Numbers
Right Triangles
Parametric Curves