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Let its length be 4x and its width be x:-

So: 4x times x = 30976 sq cm => 4x squared = 30976 sq cm

Then: x = square root of 30976/4 => 88

Perimeter: (4*88)+(4*88)+88+88 = 880 cm

Check: (4*88)*88 = 30976 sq cm

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