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= 1/2 12.20. sin 60
= 120.1/2
= 60 cm kuadrat
r = 20 cm
sudut P = 60°
Luas Δ = 1/2 x q x r x sin P
= 1/2 x 12 x 20 x sin 60°
= 120 x 1/2 √3
= 60 √3 cm2
Jadi, luas segitiga tersebut adalah 60√3 cm2