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Sinα = 4/4,5 = 8/9 = 0,8889 ⇒ α = arc Sin 0,8889 ⇒ α = 62,73'
Jadi sudut yang dibentuknya adalah 62,73'
6) 45' = 1/4 π , 135' = 3/4 π , 210' = 7/6 π , 600' = 10/3 π , dan 345' = 23/24 π
7) Sin Ф = 1/2 √2 ⇒ Ф = 45' CotФ = Cot45' = 1
CosФ = Cos45' = 1/2 √2 SecФ = Sec45' = √2
TanФ = Tan45' = 1 CscФ = Csc 45' = √2
8) AB = √(25²-7²) = √(625-49) = √576 = 24
Sin A = 7/25 , Cos A = 24/25 dan Tan C = 24/7
Mudah-mudahan bermanfaat