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4(P+L+T) = kerangka1 balok
4(7n+2n+3n) = 192
12n = 192/4
12n = 48
n =48/12 =4
# P = 7n= 7(4) = 28
L= 2n= 2(4) = 8
T= 3n= 3(4) =12
# LP= 2(PL+PT+LT)
= 2 (28x8+ 28x12+ 8x12)
= 2( 224+336+96)
= 2(656)
= 1.312 cm²