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L = 1/2 . a . b . sin C (sin C itu sudut yg mengapit a dan b)
= 1/2 . 11. 10. sin 30
= 27, 5 cm^2
= 1/2 . 11 . 10 . 1/2 = 55/2 cm^2 = 27 1/2 cm^2 = 27,5 cm^2