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To calculate the perimeter of a rectangle one adds twice the width and twice the length... in this case (2 x 3 metres) + (2 x 7 metres) = 6 metres + 14 metres = 20 metres.

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Q: Perimeter of a rectangle 3 meters by 7 meters?
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Perimeter of a rectangle 4 meters by 7 meters?

Perimeter of a rectangle = twice (length + width), in this case 22 m.


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