Question

A particle covers half of a circle of radius R then in the distance and displacement of the particle are

Answer 1

The Distance Covered By The Particle Will Be Half The Circumference Of The Circle 
=> Distance = 1/2 x 2πR = πR  

However, Distance Is Always Taken In A Straight Line.....So,
Displacement = 2R (Since The Point Is Exactly Diametrically Opposite)

Therefore, Difference Between Distance And Displacement Covered By The Particle Will Be
                             πR - 2R = (π-2)R ≈ 0.14R