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Projection of vector in R2
Author:
sealion1215
GeoGebra
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判斷球體
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
柱體建築師
球体的体积推导（优化版）
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三角形面積與內切圓半徑
角平分線性質
ghseh 二次函數描點法上下平移-2
分割三角柱
Ex.2
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Vectors
Equations
Similar Triangles
Line Segment
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