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习题3c第七题（奇怪的水坝）
Author:
纪露结
GeoGebra
New Resources
找出對稱軸
判斷球體
小数 的副本
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
Discover Resources
相似多邊形-縮放的性質
Apollonius Problem 5 CPP pocelet
gslsb 正方形數列
序列嵌套
中心对称与轴对称图形.许兴华数学
Discover Topics
Intersection
Scatter Plot
Limits
Variance
Incircle or Inscribed Circle