Question

The circumference of a circle is 49.3km.
Find the length of the radius.
Give your answer rounded to 3 SF.​

Answer 1

Circumference of a circle = 2πr unit

                           49.3 km = 2 * 22/7 * r

                                       r = 49.3*7 / 2 * 22

                                         = 345.1 / 44

                                         = 7.84318181818

So the length of the radius is 7.84318181818