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銳角三角：tan
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
Nested spiral octagon
兩組對邊相等的四邊形
四邊形的特性
Earth with coastline
美國國旗 (Codex 版)
Discover Resources
滚动的硬币
斜率
圓錐截痕模型
F1Ch8 Translation basic
双曲线定义
Discover Topics
General Quadrilateral
Tangent Function
Rational Numbers
Mode
Symmetry