Metal rails

Dad needs to improve the edges of the wooden boxes - to be reinforced with metal rails. How many cms of rails will he need if the box has the shape of a prism with the length of the edges 70cm 70cm and 120cm?

Correct result:

x =  1040 cm

Solution:

a=70 cm b=70 cm c=120 cm  o=2⋅ (a+b)=2⋅ (70+70)=280 cm  x=2⋅ o+4⋅ c=2⋅ 280+4⋅ 120=1040=1040 cm x1=4⋅ (a+b+c)=4⋅ (70+70+120)=1040 cm x1=x

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