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56 cm = 2(p+l)
56 cm = 2(l+4+l)
56 cm = 2l+8+2l
56 cm = 4l+8
4l = 56-8
4l =48
l = 48/4 = 12 cm

jadi,
Panjang = 12+4= 16 cm
Lebar = 12 cm

L = p × L
L = 16 × 12 =192 cm²

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