View Single Post
Old 06-22-2013, 01:30 PM
  #3  
mom-6
Super Member
 
mom-6's Avatar
 
Join Date: Feb 2010
Location: Texas
Posts: 6,395
Default

Your regular ruler should have those lines marked at one or both ends.
90 degree is just the regular square corner. 45 degrees is the diagonal from corner to opposite corner of a square.
mom-6 is offline