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p = x + 8 cm
K = 68
2(p+l)= 68
p+l = 68/2
x + 8 + x = 34
2x + 8 = 34
2x = 34 - 8
2x = 26
x = 26/2
x = 13
p = 13 + 8 = 21
l = 13
Luas = p x l
= 21 x 13
= 273 cm²