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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Perimeter of a rectangle = twice (length + width), in this case 22 m.
22 meters.
The perimeter is 42 metres.
Perimeter: 7+3+7+3 = 20 inches Area: 7 times 3 = 21 square inches
A rectangle 10.5 x 3 will have a perimeter of 27 in.