so just find circumference is circumfernce=2pir or pid so diameter 2.5 ft just for this problem aprox pi=3.14 so c=pid c=3.14(2.5) c=7.85
a. 7.85 ft
b. how many times revolution till one mile (5280) so 7.85 times x revolutions=5280 divide both sides b y7.85 x revolutions=672.61 round up so we complete the mile (about how many times..) 673 is the answer
