Find a positive angle less than one revolution around the unit circle that is co-terminal with the given angle: 52pi/5

we know that
Two angles are said to be co-terminal if they have the same initial side and 
the same terminal side. 

(52π/5)-----> 10.4π
so
(52π/5)-5*2π------> (2π/5)

the answer is
the positive angle less than one revolution around the unit circle that is co-terminal with angle of 52π/5 is 2π/5