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Orthocentre

Author:Big Lee

New Resources

四邉形 (四年級) 教師版
兩組對邊相等的四邊形
畫出對稱圖形
直角坐標平面上的旋轉變換
四邊形的特性

Discover Resources

外心
棒形圖(我最喜愛的科目)
面積4
七巧板（tangram）的副本
圆锥圆柱圆台的侧面展开图(及侧面上两点的最近曲线)

Discover Topics

Frequency Distribution
Rhombus
Addition
Upper and Lower Sum or Riemann Sum
Polygons

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