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习题3c第七题（奇怪的水坝）
Author:
纪露结
GeoGebra
New Resources
拼砌四邊形
Nested spiral octagon
兩組對邊相等和有直角的四邊形
找出對稱軸
直角坐標平面上的旋轉變換
Discover Resources
方格紙上畫平行四邊形1
三角柱展開圖
學習單：三角形任一外角與內角關係
y=-3x+6(x>=3)
常用對數
Discover Topics
Angles
Geometric Mean
LCM and GCD
Similarity Transformation or Similarity
Piecewise Functions