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Heron formula
Author:
ralphchen
GeoGebra
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垂直線的斜率
多邊形的面積
比較五件物件的重量
撒针估算面积实验
科氏力 (Coriolis Force)
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千變萬化的顏色
平方數平方數
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六芒星
雙曲線2 交點法
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Optimization Problems
Trigonometric Functions
Perimeter
Addition
Statistics