text: (1) The wing r?rc11, S, is simply the plan 
  surface area of the wing. Although a por- 
  tion of the area may be covered by fuselage 
  or nacelles, the pressure carryover on these 
  surfaces allows legitimate consideration of 
  the entire plan area. 
  
  (2) The wing ~ptia, 6, is measured tip to 
  
  tip. 
  
  (3) The avcragc chord, c, is the geometric 
  average. The product of the span and the 
  average chord is the wing area (6X6=$). 
  
  (4) The aspect ratio, AR, is the proportion 
  
  of the span and the average chord. 
  
  AR=b/c 