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比較角的大小3
Author:
cheukyiu813
GeoGebra
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球体的体积推导
球体的体积推导（优化版）
拼砌四邊形
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
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題 3
正四面體的反射對稱
正方體和長方體體積計算公式
第六次:20190412
尝试绘本
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Terms
Dilation
Equilateral Triangles
Matrices
Integral Calculus