segitiga abc sudut a 60 sidit b 75 dan panjang bc 9 cm panjang disi ab ?

<c = 180 - <a - <b = 180-60-75 = 45
ab/sin c = bc/sin a
ab/sin 45 = 9/sin 60
ab/(1/√2) = 9/(√3/2)
ab(√3/2) = 9(1/√2)
ab = (9/√2) × (2/√3)
ab = 18/√6
rasionalkan
18/√6 × √6/√6
= 18√6 / 6
= 3√6