The total length around an enclosed area.
Determine the perimeter of the following shape.
\(\begin{aligned} &\space\text{Perimeter} \\\\&=PQ+QR+RS+ST \\&\quad +TU+UV+VW+WP \\\\&=4+3+4+3+4+9 \\&\quad+12+9 \\\\&=48\text{ cm}. \end{aligned}\)
Steps to estimate the perimeter of various shapes.
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