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Author:
tinlonghung
GeoGebra
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平行線的判定
圓的基本性質
双心四边形
百分數及其應用
直線的斜率：水平變化 & 鉛垂變化
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电子表格建点
拋物線的參數
f-10-2-poly3-gph-bac-2&3
Tangent from an external point
割圓
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Parallelogram
Upper and Lower Sum or Riemann Sum
Dilation
Geometric Distribution
Surface