Someone help with this please and thanks

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

Acircle has a circumference of 28.36 units what is the diameter of the circle

With alll of except for the 2 that i did already