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l = 3x
K = 2 (p + l)
64 / 2 = 5x + 3x
32 = 8x
x = 4
p = 5x ==> 5(4) = 20 cm
l = 3x ==> 3(4) = 12 cm
klo yg dit. L = 20 × 12
= 240 cm²