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40 = 24 + 2l
2l = 16
l = 8
Luas : p x l
12 x 8 = 96 cm persegi
40 = 24 + 2l
40 - 24 = 2l
16 / 2 = l
8 = l
L = P × l
L = 12 × 8
L = 96 cm²