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∠AOB = 90⁰
∠AOB = ∠AOC + ∠BOC
90⁰ = (6x + 4)⁰ + (5x+9)⁰
90⁰ = (11x + 13)⁰
90⁰ -13⁰ = 11x
77⁰ = 11x
x = 77 / 11
x = 7⁰
Besar sudut penyiku ∠AOC adalah ∠BOC, maka :
∠BOC = (5x + 9)⁰
∠BOC = ( 5·7+9)⁰
∠BOC = (35+9)⁰
∠BOC = 44⁰
Semoga dapat membantu!