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圓周 (圖形F) 的複本
Author:
Michael Ma
,
Keith Ko
移動右圖中的紅線到左方虛線，就知道它是相等於左圖的哪條線。
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拼砌四邊形
三位數除以一位數（一）
算柱 (兩位數)
兩位數除以一位數（一）
直角坐標平面上的旋轉變換
Discover Resources
T,N,B vectors of space curve.
Angle between a Line and a Plane
Tangent from an external point
zentangle
第一个绘本
Discover Topics
Bar Chart or Bar Graph
Quadratic Equations
Triangles
Differential Calculus
Incircle or Inscribed Circle