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L = 9 x 12 x 1/2
L = 9 x 6 = 54 cm²
L = a x t x 1/2
54 = BC x AD x 1/2
54 = 15 x AD x 1/2
54 = 7,5 x AD
54 : 7,5 = AD
7,2 = AD
7 2/10 = AD
7 1/5 = AD
Maka, C