Construction 82703

The plot of land for constructing family houses is shaped like a rectangular trapezoid with bases of 21m and 11.2m. For CZK 2,500 per square meter, the value of the land is calculated at CZK 1,352,400. What would be the length of wire mesh needed to fence this property?

Correct answer:

x =  100.8 m

Step-by-step explanation:

$$\begin{gathered} a=21\text{m} \\ c=11.2\text{m} \\ S=1352400/2500=\frac{13524}{25}=540.96{\text{m}}^2 \\ S=\frac{a+c}{2}\cdot v \\ v=\frac{2\cdot S}{a+c}=\frac{2\cdot 540.96}{21+11.2}=\frac{168}{5}=33.6\text{m} \\ b=\sqrt{v^2+(a-c{)}^2}=\sqrt{33.6^2+(21-11.2{)}^2}=35\text{m} \\ d=v=33.6=\frac{168}{5}=33.6\text{m} \\ x=a+b+c+d=21+35+11.2+33.6=100.8\text{m} \end{gathered}$$

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