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製作梯形1 Making trapezium 1
Author:
周錦鋒
GeoGebra
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常见四边形是否是双心四边形
异形操场
椭圆内切圆链
比較五件物件的重量
盈利與虧蝕
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正n邊形內角與外角
認識圓
平行四邊形面積
Oscillations
剪切成正三棱柱(制作:李三军,修订:孟宝兴)
Discover Topics
Inequalities
Ellipse
Quadrilaterals
Parallelogram
Trapezoid