Question

An athlete runs around a circular park 10 times. If the diameter of park is 280 m. Find the distance covered by the athlete in km.

Answer 1

find = circumference in km
circumference=22/7*d
                     =22/7*280m
                       =880m
                       =0.88 km

Answer 2

to find the circumference of this circle whose radius is 280 we can use formula 22d/7 or 2×22/7×r
therefore 22/7×280=880m
he covers 880 km in 1 round, so in 10 rounds he will cover 10×880=8800m and
to convert this distance into km=8800/1000
8.800km