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l = x ⇒ 16 cm
K = 2 (p + l)
128 = 2(3x + x)
128 = 2 . 4x
128 = 8x
16 = x
L = p.l
L = 48 . 16
L = 768 cm²
l = 128 /8 = 16cm
p = 3 x 16 =48cm
luas = 48cm x 16cm = 768cm2