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三角形的四心－五線－內外二圓
Author:
Ho-Kai Chen
四心：內外重垂
GeoGebra
New Resources
畫出對稱圖形
【案例】2018年全国1卷理科12题
找出對稱軸
判斷球體
兩位數加法
Discover Resources
星球運動模擬
繡曲線
滑桿動畫示範-3(畢氏定理)
橢圓規Ellipsograph of Parallelogram
Copy of 劉徽的「割圓術」
Discover Topics
Congruence
Fractal Geometry
Solids or 3D Shapes
Pyramid
Trapezoid