If a "3 point line" refers to a line that is three points wide, then the line is 3/72 inches wide, or 1/24 inches wide.
Inside of a property line would be the area that the perimeter of the property encloses. If you draw a rectangle on a piece of paper the area inside the lines would be the same as the inside of a property line.
Not necessarily. Property lines are established by surveys. The sidewalk may be one of the fixed points they use to establish the location of the property line, but otherwise it is unrelated to the property line.
The fence cannot be outside your property line.
The mark property line is located on the eastern side of the map.
Yes.
you need to read the deed description carefully to determine where the property lines are. A building line is generally not a property line. As for the utility easement area, your property may run up to the easement line or the easement may be on your property. If you do not understand the description in your deed you should contact the attorney who represented you at the time of purchase and ask her to review the deed with you. There may be a survey of your property recorded in the land records. You could also take your deed with you to the town assessor's office where you may be able to obtain a copy of the assessor's map that shows the location and dimensions of your lot.
property line
property line
It depends on what you mean by surveying your property. Most laws allow a surveyor to access abutting property as necessary in order to survey a common property line. Therefore, yes, a surveyor can survey your property line where it abuts your neighbor and make any calculations necessary to set a legal property line.
Typically you are not to build a fence anywhere past your property line.
The property line defines the property, so it can't be 'past' the defining limit. You need to make sure you know where your property line is and make sure you take care of it. If you have taken property that is beyond your deeded or surveyed property line by following the necessary requirements for adverse possession, then you will need to protect your property rights from others taking it back from you, just as with any other real estate. Your local jurisdiction will have procedures for filing papers in court that will "quiet title" on the newly established property line, so you will have a "deed" with a legal description that includes the additional property you have taken.