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K = 38 cm
p = l + 5
maka :
K = 2 x (p+l)
38 = 2 x (l + 5 + l)
38 = 4l + 10
4l = 38-10
l = 28/4
l = 7 cm
jadi panjang = p = l+ 5 = 7 + 5 = 12
L = p x l
= 12 x 7 = 84 cm²