1 km = 1000 metres.
Therefore 60 sq km = 60 km*km = 60 *1000 m *1000 m = 60 million sq metres.
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A unit circle is not normally called 2 pi. Because the radius length measure of the unit circle is 1 unit, then the circumference of a unit circle is 2*pi, and its area is pi.
A yard is a unit of distance. An acre is a unit of area. The two units are therefore incompatible.
A hectare is a unit of area. A centimetre is a unit of distance. The two units are therefore incompatible.
A foot is a unit of length. An acre is a unit of area. The two units are therefore incompatible.
That is known as a unit rate.