Wait is there any other information?
Answer:
a) The radius of the wheel is 1) more than 25.0 cm.
b) The radius of the wheel is approximately 40.925556... cm
Step-by-step explanation:
S = rθ is the formula to find the radius of the wheel using the arc and the angle discovered, S being the arc and θ the angle. The angle, however, must be in radians. θ =
is used to convert it. So:
θ = 
θ = 
S = rθ
25 = r 
900 = 7
r
r = 
r = 40.925556... cm
(4/5) / (4/9) = 4/5 * 9/4 = 36/20 = 9/5 = 1 4/5 miles per hour
so B.) one and four-fifths mph