A wheel 30 cm in radius rotates 4π radians along a road. How far did it travel

Each rotation of the wheel covers one circumference.

A circumference = 2·Π·r     --->     circumference  =   2·Π·30  =  60Π cm  ≈  188.49556 cm per circumference

How many circumferences are there in 41 radians?

     Since there are 2Π radians in one circumference,

             there will be 41 / (2Π) circumferences  ≈ 6.52535 circumferences

Putting this together, 6.52535 circumferences and each circumference ≈  188.49556 cm

     6.52535 x 188.49556 ≈  1230 cm