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兩組對邊相等的四邊形
画直线等分三角形的面积
球體建築師
拼砌四邊形
柱體建築師
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F.3 Ch.10 Application of Trigonometry
三角形
從長方形的「周界」找回它的「長」和「闊」
幻彩圆
一次函数经过象限操作
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Triangles
Conic Sections
Upper and Lower Sum or Riemann Sum
Calculus
Cosine