Cuboid box

How many m2 paper is needed for the sticking cuboid box of dimensions 50 cm, 40 cm and 30 cm? To the folds add one-tenth the area.

Correct result:

x =  1.034 m2

Solution:

q=1+1/10=1110=1.1 a=50 cm→ m=50/100  m=0.5 m b=40 cm→ m=40/100  m=0.4 m c=30 cm→ m=30/100  m=0.3 m  S=2⋅ (a⋅ b+b⋅ c+c⋅ a)=2⋅ (0.5⋅ 0.4+0.4⋅ 0.3+0.3⋅ 0.5)=4750=0.94 m2  x=q⋅ S=1.1⋅ 0.94=517500=517500 m2=1.034 m2

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