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L segitiga = 1/2 a t = =1/2 . ac . ab = 1/2 . 3 . 4 = 6 cm²
B.
1/2 . ac . ab = 1/2 . bc . ad
1/2.3.4 = 1/2 . 5 . AD
6 = 5/2 AD
AD = 6. 2/5
AD = 2,4 CM