A rectangular piece of land measuring $0.7 k m$ by $0.5 k m$ is to be fenced with four rounds of wires. What length of the wire is needed?

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Solution

$\begin{matrix} l e n g t h = 0.7 k m b r e a d t h = 0.5 k m \end{matrix}$
length of wire needed
$\begin{matrix} = 4 \times p e r i m e t e r o f l a n d = 4 \times 2 \times (l e n g t h + b r e a d t h) = 4 \times 2 \times (0.7 + 0.5) = 8 \times 1.2 = 9.6 k m \end{matrix}$

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