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sinα + sinβ > 0 ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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拼砌四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
找出對稱軸
兩組對邊相等的四邊形
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幾何圖形
第12届美国中学生数学邀请赛题
探究平行四邊形面積
分數與小數的副本
第八周作业2
Discover Topics
Geometric Transformations
Limits
Constructions
Vectors
Quadratic Equations