http://www.askmen.com/grooming/appearance/the-perfect-haircut-for-your-head-shape.html 

The Perfect Haircut For Your Head Shape

Geometry Of The Perfect Haircut: We Ran The Numbers. Now Bring On The Scissors. 

by: Ahmed Zambarakji 

While your stylist/barber might seem like a creative visionary, a good haircut is all about basic mathematics — second grade geometry, to be precise. In fact, it is a basic understanding of shape and space that determines whether that impulsive desire to rock a topknot will come off as hipster rather than hobo.

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