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版本5
Author:
zbzhen
GeoGebra
New Resources
圓的基本性質
平行線的判定
直線的斜率：水平變化 & 鉛垂變化
异形操场
正方形雪花图案
Discover Resources
Tangents from an External Point
圓內正方形夾小圓
equations of circle 2
圓例4
金惠吉：正弦交流电演示
Discover Topics
Mathematics
Quadratic Functions
Algebra
Rhombus
Scalene Triangles