It is 56.4 units.
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Assuming squre is supposed to be square. How many squre metres in a kilometre? 1,000. Right? The area of a squre is? A x B. Right? So that's 1,000 x 1,000. Right? Which is? 1 million squre metres. Right? It's not rocket science. How old are you? 3!
a squre
64 is a perfect square number.
perimeter.