Cardboard

How many m2 of cardboard are needed to make the cuboid with dimensions 40 cm 60 cm and 20 cm?

Correct result:

x =  0.88 m2

Solution:

a=40/100=25=0.4 m b=60/100=35=0.6 m c=20/100=15=0.2 m x=2⋅ (a⋅ b+b⋅ c+a⋅ c)=2⋅ (0.4⋅ 0.6+0.6⋅ 0.2+0.4⋅ 0.2)=2225=0.88 m2

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