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Introduce tangent ratio
Author:
VCChung
GeoGebra
New Resources
兩位數加法
異分母分數減法
兩位數除以一位數（一）
找出對稱軸
錐體建築師
Discover Resources
量度身高
semops_圓柱
Copy of 劉徽的「割圓術」
多邊形與圓_2
三角形面積
Discover Topics
Equations
Continuity
Integral Calculus
Sequences and Series
Pie Chart or Circle Chart