# Cardboard

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

Result

x =  0.88 m2

#### Solution:

$a = 40/100 = \dfrac{ 2 }{ 5 } = 0.4 \ m \ \\ b = 60/100 = \dfrac{ 3 }{ 5 } = 0.6 \ m \ \\ c = 20/100 = \dfrac{ 1 }{ 5 } = 0.2 \ m \ \\ x = 2 \cdot \ (a \cdot \ b+b \cdot \ c+a \cdot \ c) = 2 \cdot \ (0.4 \cdot \ 0.6+0.6 \cdot \ 0.2+0.4 \cdot \ 0.2) = \dfrac{ 22 }{ 25 } = 0.88 = 0.88 \ m^2$

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