You generally cannot read 0.126 mm on a ruler. You would be lucky to be able to resolve 0.2 or possibly 0.1, but not 0.126. Even if you could, and its true that 0.126 is about 1/8, the standard for accuracy in a measuring device is ± one half of a minor division - that is ± 0.5 mm, so a reading of 0.126 mm is meaningless, unless you had a much finer lined ruler and a microscope.
by using a ruler and a compass
Clock is to time as ruler is to distance.
In the world of Drafting and Architecture, it is called a Scale.
A ruler
5.5 cm
you read a ruler by conting the little lines first
by the numbers that are marked there
Yes!
A ruler or scale should not be read to less than the smallest graduation. In practice, in-between measurements can be estimated but they are not significant.
You look at the markings on its edge.
You could align the edge of the object with the zero on the ruler and then read off the marking on the ruler which aligned with the other end of the object.
To record measurements using a ruler, place the ruler next to the object to be measured. Ensure that the zero mark on the ruler aligns with one end of the object. Read the measurement where the other end of the object falls on the ruler and record it in the appropriate units.
Read about Cnut in full on http://www.englandandenglishhistory.com
You have to give the choices. I am not a wizard, so I can't read your mind.
3. ab.c centimetres or abc millimetres
read this article http://en.wikipedia.org/wiki/World_War_I If you can't be bothered to read that then basically an Austrian ruler was assassinated
To use a ruler, place the 0 mark at one end of the object you want to measure. Then, read the measurement at the opposite end where it aligns with the ruler markings. Make sure to use the correct units (inches, centimeters, etc.) as indicated on the ruler.