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正四角錐兩側面夾角
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
近似值：有效數字
第八周作业
兩位數除以一位數（一）
兩組對邊相等的四邊形
畫出對稱圖形
Discover Resources
已知橢圓 x^2/a^2+y^2/b^2=1 (a>b>0)
PMC 2014-15 Q5
上圓下方的盒子
三平行線上作正三角形
全等—正方形的旋转
Discover Topics
Solids or 3D Shapes
Interest Calculation
Rational Numbers
Tangent Line or Tangent
Quadratic Equations