Probably meters.
Centimeters would be most convenient metric unit for the diameter of a dinner plate.
Millilitres (mL) would be the best metric measure for a cup of water.
To measure a diameter, or length, you would use meters, centimeters, or millimeters. To measure the surface area, use square meters, etc. To measure the volume, use cubic meters, etc.
What metric unit would you use to measure a computer keyboard
milimetersMilliliter
Millimeters.
inches or centimieters
Probably meters.
Centimeters would be most convenient metric unit for the diameter of a dinner plate.
You should clarify what you want to measure about it: its diameter, mass, weight, color, etc. If you want to measure its diameter, that would usually be specified in microns (= micrometers).
Meter.... or more likely millimeters
You could measure it with either a yard stick or meter stick. If you want to measure the basketball court in metric units, then you would use the meter stick. If you want to measure the basketball court in English units, you would use the yard stick.
It depends on whether you want to measure its diameter, circumference, capacity, mass, density, thermal conductivity, temperature, etc.
Millilitres (mL) would be the best metric measure for a cup of water.
To measure a diameter, or length, you would use meters, centimeters, or millimeters. To measure the surface area, use square meters, etc. To measure the volume, use cubic meters, etc.
What metric unit would you use to measure a computer keyboard