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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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第八周作业
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
錐體建築師
找出對稱軸
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容積上升(立體、平面)
中点轨迹
三圓外切
面外一點
congruent activity
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Equations
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Centroid or Barycenter
Dilation
Complex Numbers