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1cm = 10mm 32mm x 1cm/10mm = 3.2cm
80mm x 32mm = 2560mm2
answer is 14.3 Kg.
1cm2 = 1cm x 1cm 1cm = 10mm 10mm x 10mm = 100mm2 100mm2 equals 1cm2.
1cm = 10mm 14.5cm = 14.5 x 10mm = 145mm