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lebar = x - 8
K = 2 (p + l)
72 = 2 (x + x-8)
72 = 2 (2x-8)
72 = 4x - 16
72+16 = 4x
88 = 4x
x = 88/4 = 22 cm
Maka, panjang = 22 cm
lebar = x - 8
= 22-8 = 14cm