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Angle of Elevation & Angle of Depression 仰角和俯角
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
New Resources
兩位數除以一位數（二）
兩位數加法
兩組對邊相等和有直角的四邊形
球体的体积推导
球体的体积推导（优化版）
Discover Resources
Vector equation in R2
圓與切線
直角三角形與正三角形
拋物線基本名詞介紹
旋轉4
Discover Topics
Volume
Stochastic Process or Random Process
Upper and Lower Sum or Riemann Sum
Integers
Pie Chart or Circle Chart