C = π d
C= circumference
d= diameter
π = circumference to diameter ratio
C = 907.46 units ( given)
π = 22/7 or 3.14 approximate
d = ?
now substitute the given values in the formula, we have
907.46=22/7 x d
907.46 x 7 = 22d
d = 907.46 x 7÷22
d= 288.7372 or round about
d= 289