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圓與切線
Author:
13陳柏禎
圓與切線
GeoGebra
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常见四边形是否是双心四边形
双心四边形
祖冲之的期望：内棋与外棋
直線的斜率：水平變化 & 鉛垂變化
撒针估算面积实验
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平行四邊形
專題
三角形內角和_2
k126各國基地
GGBex2
Discover Topics
Median Value
Planes
Hyperbola
Rational Numbers
Combinatorics