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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
算柱 (兩位數)
画直线等分三角形的面积
兩位數除以一位數（一）
拼砌四邊形
判斷球體
Discover Resources
中點軌跡(動點在兩圓上)
數值滑桿
ex_1
S1 Ex9.2 Q17
圓周分層工作紙LV3答案
Discover Topics
Complex Numbers
Sine
Pie Chart or Circle Chart
Rotation
Vectors