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Angle of elevation and Angle of depression(仰角和俯角)
Author:
chisunch1
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩位數除以一位數（二）
異分母分數減法
四邉形 (四年級) 教師版
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demo
星星
雙曲線2--焦點法
圓周公式應用題2的副本
Magic Matches
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Orthocenter
Natural Numbers
Quadratic Equations
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Angles