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l = x
keliling = 2(p+l)
68 = 2(x + 4 + x)
68 = 2(2x + 4)
68 = 4x + 8
68-8 = 4x
60 = 4x
x = 60/4
x = 15
p = x +4 = 15 + 4 = 19 cm
l = x = 15 cm
luas = p x l
luas = 19 cm x 15 cm
luas = 285 cm²