Answer: Acre, Meter, Kilometer, etc.
Answer: You need some square unit. The standard SI unit for area is square meter, but you can also use hectars (= 10,000 square meters) or square kilometers.
Metres
Potatoes are sold by the kilogram.
To measure the mm of an item you would need to use a metric ruler. The metric ruler has cm and mm on it.
centimeter
You would measure that in grams, or milligrams.
Metres
To measure a soccer field in the metric system, you would use a metric measuring tape or a measuring wheel. The units used could be meters or centimeters. In the English system, you would use a tape measure or a measuring wheel calibrated in feet or yards. The units used would be feet or yards.
You would use the metric unit "liters" to measure the capacity of a hot water tank.
Metres
You would use kilograms (kg) to measure someone's mass in metric units.
You would typically use the metric unit of centimeters to measure the growth of your hair.
You would use liters (L) to measure the volume of a soda container in the metric system.
You would use the metric unit "kilograms" to measure the weight of a bag of groceries.
Potatoes are sold by the kilogram.
kilograms
A thermometer.
distance