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三角形的外心
Author:
侯杰材
GeoGebra
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兩組對邊相等的四邊形
判斷球體
四邊形的特性
拼砌四邊形
【案例】2018年全国1卷理科12题
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拋物線?
拋物線聖路易拱門
assigment7
小立方体组合的三视图【鼠标拖动法】
圓周公式的應用
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Right Triangles
Reflection
Planes
Symmetry
Trapezoid