title: Generating lines at an increment
body: <p>Given a line AB, how would I generate two lines perpendicular to AB such that they both divide it into thirds (or any other fraction, for that matter)?</p>
  
  <p>I originally thought to find the length of AB by using the distance formula on points A and B and then drawing two lines at increments of 1/3 the length of AB on it, but that seems both inefficient and impractical if used many times at once. </p>