Question

A PERSON WALKS ALONG A SEMICIRCULAR PATH FROM A TO B .CALCULATE THE DISTANCE AND DISPLACEMENT TRAVELLED BY THE PERSON .

Answer 1

The distance covered by the person = πr ( as perimeter of a circle is 2πr, hence the perimeter of the semicircle is πr )
the displacement (shortest distance )covered = diameter of the semicircle .

Answer 2

path followed is circle circumference of circle is 2pieR(R is radius) but here is semicircle therefore it distance is pieR and displacement is a shortest distance covered and i.e radius of circle