The circumference of a bicycle wheel is 308 cm , Find it's radius

The formula for the circumference $C$ of a circle with radius $r$ is:

$$C = 2\pi r$$

Given $C = 308$ cm. We will use $\pi = \frac{22}{7}$.

$$308 = 2 \times \frac{22}{7} \times r$$

$$308 = \frac{44}{7} r$$

To isolate $r$, multiply both sides by $\frac{7}{44}$:

$$r = 308 \times \frac{7}{44}$$ $$r = \frac{308 \times 7}{44}$$ $$r = \frac{2156}{44}$$ $$r = 49$$

The radius of the bicycle wheel is 49 cm.

The radius of the bicycle wheel is $\text{49 cm}$.