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2(P * L) + 2(P * T) + 2(T * L)
= 2 ( 12 * 4) + 2(12 * 3 ) + 2 (4 * 3)
= 2 * 48 + 2 * 36 + 2 * 12
= 96 + 72 + 24
= 192 cm²
=2 x (12.4)+(4.3)+(12.3) = 192 cm²