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Anonymous
It is: 6+6+6+6 = 24 cm because 6*6 = 36 square cm
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20 cm
The length is (18 centimeters) minus (the width)
24 cm
Area = 36 cm2 => side length = sqrt(36) cm = 6 cm So perimeter = 4*side = 4*6 = 24 cm.