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包絡線
Author:
hou yi ting
孢落限
GeoGebra
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兩組對邊相等的四邊形
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
近似值：有效數字
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熱帶魚 (顏色變更)楊靜宜
Features from Vertex form
P3 平行與垂直01 測試
比較角的大小(直接比較)
Copy of 劉徽的「割圓術」
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Means
Numbers
Parabola
Trapezoid
Sequences and Series