Rectangular 69214

The area of ​​the rectangular plot with a length of 70m is 2100m². How many meters of mesh is needed to fence it if the inserted sheet metal gate is 1.5 m wide?

Correct answer:

x =  198.5 m

Step-by-step explanation:

$$\begin{gathered} a=70\text{m} \\ S=2100{\text{m}}^2 \\ c=1.5\text{m} \\ S=ab \\ b=S/a=2100/70=30\text{m} \\ x=2\cdot a+2\cdot b-c=2\cdot 70+2\cdot 30-1.5=198.5\text{m} \end{gathered}$$

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