First of all, you would only use these units if you lived in a place which used obsolete units - the US. Then, the answer depends on why you wish to measure it. If for estimating the cost of carpeting, using feet would be appropriate but if you were the carpet fitter, you may wish to use inches.
The best unit for measuring the length of a pencil is inches.
which is a better estimate for length of a pencil
The best unit of length for measuring the length of a ladybug is millimeters. Ladybugs are small insects, typically measuring around 5 to 10 millimeters in length, making millimeters a precise and appropriate choice for capturing their size accurately. Using centimeters or inches would be less suitable, as they would not provide the same level of detail.
In the US, doors are sold in inches. If you are measuring the door in order to bring in some furniture, any measurement of length - inches or centimeters - will work. It is in centimeters. That is more appropriate
Either a meter stick or a metric tape.
The best unit for measuring the length of a pencil is inches.
A millimetre.
centimetres
unit for measuring length
Length in inches.
which is a better estimate for length of a pencil
a tape measure
the meter.
Feet and inches.
Millimetres.
a tape measure
The best unit of length for measuring the length of a ladybug is millimeters. Ladybugs are small insects, typically measuring around 5 to 10 millimeters in length, making millimeters a precise and appropriate choice for capturing their size accurately. Using centimeters or inches would be less suitable, as they would not provide the same level of detail.