a body is moving along a circular path of radius R.what will be the distance travelled and displacement of the body when it completes half a revolution and full revolution ?
 

When the body would have completed a semi-circle,

Then the distance would be the circumference of the semi-circle = πr

Also the displacement is the shortest distance travelled between the initial and final point =R +R = 2R

When, the 
body would have completed a full circle,

Then the distance would be the circumference of the circle = 2πr

And the displacement = 0 (initial and final points are same)

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When it completes half revolution
then distance=pi  R
displacement=2R
​At full revolution
distance=2piR
 
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