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Sisi b = c = 10 cm
Kedua sisi mengapit ∠A
Luas Δ = 1/2 x b x c x Sin ∠A
Luas Δ = 1/2 x 10 x 10 x Sin 120°
Luas Δ = 50 x √3/2
∴ Luas Δ = 25√3 cm²