Final answer:
To find the radius of a bicycle wheel when given the circumference, divide the circumference by 2π.
Step-by-step explanation:
To find the radius of a bicycle wheel when given the circumference, you can use the formula C = 2πr, where C is the circumference and r is the radius.
Given that the circumference is 1540, we can rearrange the formula to solve for r: r = C / (2π).
Plugging in the values, we have r = 1540 / (2π).
Now, we can calculate the approximate value: r ≈ 1540 / (2 x 3.14) ≈ 245.53.
Therefore, the correct answer is a) 245.5.