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88 = 2 (7x + 4x)
88 = 2. 11x
11x = 88 : 2
11x = 44
x = 4
panjang = 7x = 7. 4 = 28 cm
lebar = 4x = 4. 4 = 16 cm
Luas pp = p × l
= 28 × 16
= 448 cm²