5 squares

Author:johnmayhk

Purple points are mid-points of corresponding line segments. Drag blue points to change the size and orientation of squares. Are two red line segments perpendicular to each other always?

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四邊形的特性
算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（一）
四邉形 (四年級) 教師版

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三角形重心(相關說明)
掃描不等式圖形
直線與圓的位置關係
外角和
保持比例

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Rational Numbers
Centroid or Barycenter
Parallelogram
Polynomial Functions
Right Triangles