Question

A boy completes one round of a circular path of radius 'r' in 't' seconds. The speed is: (a) Circumference of a circle/time (b) Time/Circumference (c) Area of circle/time (d) Area of circle/circumference of circle

Answer 1

Answer:

a) circumference of a circle /time taken

Explanation:

circumference(distance)=2*$\pi$*r

time taken= t seconds

hence speed = distance travelled /time taken

therefore the anwer is =2$\pi$r/t

Answer 2

Answer:

a) circumference of a circle /time taken

Explanation:

circumference(distance)=2*\piπ *r

time taken= t seconds

hence speed = distance travelled /time taken

therefore the anwer is =2\piπ r/t