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椭圆的简单作图：用中点弦
Author:
许兴华数学
Topic:
Ellipse
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等的四邊形
判斷球體
球体的体积推导
三位數除以一位數（二）
Discover Resources
畢氏定理倒水法
終點軌跡
中學(高中)
trapezoid2
畢氏定理學生(楊知樾)
Discover Topics
Trapezoid
Scatter Plot
Kite
Orthocenter
Random Experiments