Identify the Sl unit of length you would use to express the following
a length of a pencil
b. width of pencil lead
c. width of the hallway
d diameter of a piece of thread

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

Yes, take risk in life

I’m confused so sorry

Iwill you if i can