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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
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
判斷球體
球體建築師
sanjiaohanshu
Discover Resources
史坦納圓鍊 (Steiner Chain)
畢式定理 (06)
蝴蝶定理推廣證明2(交比)
二元线性规划的图解法(18.2 例5)
球体的体积推导
Discover Topics
Inequalities
Circumcircle or Circumscribed Circle
Expected Value
Arithmetic Mean
Surface