A bicycle tire has a diameter of . The tire rolls without sliding along a road. Let be the distance () the bicycle travels as the tire rotates radians. Assume to be positive and consider only its magnitude. (So, its position on the circle is not relevant.) Assume also that the distance is positive. (a)Find as a function of . Use exact values in the formula, not decimal approximations. (b)If the bicycle rolls forward , what is the angle that the tire rotates (in degrees)? Round your answer to the nearest tenth of a degree.