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kinlun_1
Author:
Ong Kin Lun
GeoGebra
New Resources
多邊形的面積
兩位數除以一位數（二）
探究三角形的全等條件
三位數除以一位數（一）
球体的体积推导（优化版）
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正七邊形2
周界-平移法(練習三)
Tangent perpendicular to radius
動態幾何錯覺
XY04 成都地铁
Discover Topics
Root
Logarithmic Functions
Trigonometry
Arithmetic Mean
Tangent Line or Tangent