Question

A body moves in circle of radius '2R' . what is the distance covered and displacement of the body after 2 complete rounds

Answer 1

Well distance is the actual path covered by the body while the displacement is the shortest distance between two points
when we talk about a circle when a body completes one round its initial and final point is same so its displacement is zero but not the distance 
the distance would be equal to circumference of the circle which is 2TTr 
here TT means pie 
so when  a body completes two round the distance covered is twice the circumference of circle = 2( 2TTr)
since radius (r)= 2R
distance = 4TT2R= 8TTR
and displacement is zero
as the initail and final point is same 
Hope this helped you 
:-)

Answer 2

$\huge \underbrace \mathfrak \pink{Answer}$