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l = (x + 8)
k =64 cm
k = 2((2x + 3) + (x + 8))
64 = 2(3x + 11)
64 = 6x + 22
6x = 64 - 22
6x = 42
x = 7
p = (2x + 3)
p = (2.7 + 3)
p = (14 + 3)
p = 17 cm
l = (x + 8)
l = (7 + 8)
l = 15 cm
maka luasnya
L = p . l
L = 17 . 15
L = 255 cm ²