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初三奥赛：圆的切割线问题
Author:
王俊辉
拖动点P，或点D，改变其位置，探究点F的轨迹。
GeoGebra
New Resources
球体的体积推导
第八周作业
探究三角形的全等條件
漂亮的摇摆曲线
GeoGebra笔记功能体验课件
Discover Resources
Angry Bird
http://www.qsir.org/?p=8853
test1
Proof of Pythagorean Theorem with Shearing
ETV 對稱
Discover Topics
Logarithmic Functions
Difference and Slope
Terms
Geometry
Bar Chart or Bar Graph