Use Object Snaps
 
 
 

To snap to a geometric point on an object

  1. At the prompt for a point, hold down SHIFT and right-click in the drawing area. Select the object snap you want to use.
  2. Move your cursor over the desired object snap location.

    If AutoSnap is on, your cursor automatically locks onto the snap location you selected, and a marker and tooltip indicate the object snap point.

  3. Select an object.

    The cursor snaps to the eligible location closest to your selection.