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K = 2(p + l)
64 = 2 (5x + 3x)
32 = 8x
x = 4 cm
panjang = 5x = 5 × 4 = 20 cm
lebar = 3x = 3 × 4 = 12 cm
64:8=8
panjang=5*8=40 cm
lebar=3*8=24 cm
semoga membantu dan maaf jika salah