Suppose you had a rectangle that was 12.75 units by 19.6 units. The area would be 249.9 square units which would round to 250 square units to the nearest square unit. Since a centimeter isn't a square unit, it can't be rounded to the nearest square unit.
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3.5 rounded to the nearest cm is 4cm
142.59996 sq kilometres, rounded to the nearest square centimetre is 1425999600000 sq cm. And if you did not mean 142.59996 sq km maybe you should have specified what you didmean.
5 cm is already rounded to the nearest 0.1 cm.
5 ft 10.5 inches = 70.5 inches = 70.5 * 2.54 cm = 179.07 inches which, rounded to the nearest cm is 179 cm.
The answer depends on the units used for 3.5