Because they were invented by Pierre Vernier in 1631.
Pythagoras
No
yes it is 2.25
Accurate linear measurement.
vernier-caliper
by dividing diameter by 2 :)
I would use vernier callipers.
yes
It is 0.1 millimetre for standard callipers.
0.1mm It is the range of verniercalliper. As it has least count 0.1mm that's why its range is 0.1 mm in physics laboratory
To measure things, or is that just too obvious? A.K.A. Vernier Callipers