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 answer:

x =  1040 cm

Step-by-step explanation:

$$\begin{gathered} a=70\text{ cm } \\ b=70\text{ cm } \\ c=120\text{ cm } \\ o=2\cdot (a+b)=2\cdot (70+70)=280\text{ cm } \\ x=2\cdot o+4\cdot c=2\cdot 280+4\cdot 120=1040=1040\text{ cm } \\ {x}_1=4\cdot (a+b+c)=4\cdot (70+70+120)=1040\text{ cm } \\ {x}_1=x \end{gathered}$$

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