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（六）组合图形的面积
Author:
玖玖
GeoGebra
New Resources
拼砌四邊形
美國國旗 (Claude 版)
sanjiaohanshu
Nested spiral octagon
美國國旗 (Codex 版)
Discover Resources
圓的展開partII
正多角錐(可輸入底面邊數)
七巧板（tangram）的副本
探索三角形外角定理
斜率是定值
Discover Topics
Matrices
Standard Deviation
Algebra
General Quadrilateral
Trapezoid