A wheel of radius 35 cm rolls along the ground. How far does it travel in one complete turn? Use π = $\frac{22}{7}$ (answer in cm).

**Circumference = π × $d=2$ × π × $r$.**

Use π = $\frac{22}{7}$ when the radius is a multiple of 7 (cleaner arithmetic). Use π ≈ 3.14 otherwise (or leave the answer in terms of π).

Example $(r=7$ cm, π = $\frac{22}{7}):C=2\times \frac{22}{7}\times 7=44$ cm.

Example $(r=5$ cm, π ≈ 3.14): $C$ ≈ $2\times 3.14\times 5=31.4$ cm.