Actually it would be measured by feet.
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With suitable use of the decimal point, any object can be measured in centimetres. Your palm is a few cm across. The length or height of a normal pet would be measured in cm. Peoples' height is measured in cm although they may be expressed in metres. Similarly, larger objects such as rooms may be measured in metres but, for precision, cm will be used.
The question does not make sense because length cannot be measured in sq cm.
Length can be measured in feet, inches and centimetres
A four sided shape with length 45 cm and width 68 cm would have a total side length of 226 cm or 2.26 m.
It would be the square root 32 in cm