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definition of trigo
Author:
sealion1215
GeoGebra
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异形操场
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
百分數及其應用
比較五件物件的重量
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數的組合(探究)
三角形3,4,5
四年級面積的量度
蜥蜴
同心六邊形
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General Quadrilateral
Quadrilaterals
Tangent Function
Trigonometric Functions
Straight Lines