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-3/2 ≤ cosα + cosβ + cosγ ≤ 3
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
前提：α + β + γ = 0
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拼砌四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
判斷球體
【案例】圆柱体内放置一个大球六个小球
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相似形的題目
TEST
Locus: Fixed Distance From Straight Line
畢氏定理習作
正方形轉轉
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Addition
Scalene Triangles
Logic
Variance
Vectors