Question

calculate the distance travelled and displacement of a boy running in a circular path of radius 21 metre when he complete half Revolution one Revolution 2 and half revolution​

Answer 1

Answer:

the displacement is the diameter of the circle as after completing a revolution it's displacement is zero. the diameter of the circle is 2times it's radius i.e. 2×21=42. It's distance is 2times it's circumference and it's semi circle's circumference. The circumference circle is 2πr=2×22/7×21=132. 2×132=264. the circumference of the circle π×r=22/7×21=66. The distance of the boy is the sum of 264 and 66=330