邊長CA = b, 邊長AB = c 夾角∠CAB = α , ∠ABC = β , ∠BCA = γ 則存在: a2 = b2 + ... 形式II: ( 已知三角形3邊長a, ,b, c , 求 ∠α, ∠β, ∠γ )
確定! 回上一頁