Martha cut a piece of material in half as shown below.
She then placed the one half on top of the other half, as shown below.
What is the perimeter of the newly formed shape in millimetres? (2 marks)
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\(\text{Calculating the perimeter from the top down:}\)
\(\text{Perimeter}\)
\(=30+2\times 50+2\times 25+2\times 30+80\)
\(=320\ \text{mm}\)