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三角形三边关系
Author:
黄维超
Topic:
Geometry
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
兩組對邊相等的四邊形
拼砌四邊形
畫出對稱圖形
Discover Resources
平行線 (同位角 - 1對)
轨迹2016.4.16
Pole & Polar
共頂點、底共線
畢氏定理拼圖007(8片)
Discover Topics
Quadrilaterals
Stochastic Process or Random Process
Vectors 2D (Two-Dimensional)
Orthocenter
Right Triangles