The Length command is often used to find the combined length of a number of elements or to find the perimeter value of a shape.
Select the command by going to the Tools menu and selecting Length ( Tools > Length) or by selecting the Length icon 
from the Toolbar or by typing LENGTH into the program.
A prompt will appear asking the user to select the elements and objects they wish to measure.
Select the elements and right click. A new box will appear, in the top right of the screen, containing the combined length of the elements or objects.
