You need to convert 5'4 to inches:
5'4 = 5 * 12 + 4 = 64
5'4 = 64 inches
One inch is 2.54 cm
mutiply by 2.54
*2.54
64 inches * 2.54 cm = 64*2.54 = 162.56 cm
easy? ;)
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Its surface area is: 2*(5*5)+4*(5*10) = 250 square cm of cardboard will be needed
5 ft 4 inches = 162.56 cm
5 ft = 152.4 cm
Volume of box: 5*4*6 = 120 cubic cm
223.52 cm