Oh, dude, for the length of a spider, you'd typically use millimeters or centimeters, like, depending on the size of the little critter. I mean, you could get all fancy and use micrometers if you wanna be super precise, but who has time for that, right? Just grab a ruler and eyeball it, like, it's not rocket science.
It depends on the spider - some Spiders can be measured in millimetres or centimetres; if you're thinking of tarantulas they could be measured in inches
If you mean what units, that would be meters.
Use Pythagoras' theorem to find the length of the 3rd side
To measure the length of a hallway, you would typically use a measuring tool such as a tape measure or a measuring wheel. Start at one end of the hallway and extend the measuring tool to the other end, ensuring it is straight and taut for an accurate measurement. Record the measurement in the appropriate units, such as feet or meters, to determine the length of the hallway.
Milligrams, usually.
On many math test and quizzes it has been inches but normally they are made to fit inches in test so i would say it would be better to go with centimeters depending on what reason you need the units for.
There are no "following" units, but I would use metres.
The same units that you use for length and distance. For example, the SI unit would be the meter.
If you mean what units, that would be meters.
Meters.
It would probably be miles.
inches in customary units
You would use square centimeters (cm^2) to measure the area of a rectangle that is 34cm in length.
Use Pythagoras' theorem to find the length of the 3rd side
You would use the unit of measurement "meters" to measure the length of a park bench.
It could be if you wished to use near-obsolete measurement units.
Volume of a rectangular block is: length*width*height. Use consistent units.
If you are able to use fractions - or smaller units - there is never a need to do so.