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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
New Resources
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
拼砌四邊形
兩組對邊相等的四邊形
找出對稱軸
Discover Resources
數的組合(探究)
gct-a01-jc091v1-27 三角形旋轉
錯角
正n邊形與圓上點的中點軌跡
mooc第四讲椭圆反射
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Symmetry
Tangent Line or Tangent
Distributions
Area
Set Theory