If you are talking about a rectangle, then it is 90 cm.
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Then the square will have 4 equal sides of 5cm with a perimeter of 20cm and an area of 25 square cm
25cm is longer than 200mm which equals 20cm
20cm daftie!! ^No, 25cm² actually. All you do is multiply 5 by 5.
2.7m
P =100