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圓周角與圓心角的關係
Author:
炫哥
GeoGebra
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盈利與虧蝕
平行線的判定
第八周作业2
比較五件物件的重量
撒针估算面积实验
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全等三角形
點之極線定理 / polar of a point theorem
等差數列的和
紙幣
五点共圆
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Diagrams
Angles
Geometric Transformations
Subtraction
Exponent