A circular manhole cover has a radius of 40 cm. Find its area. Use π = 3.14 (answer in ${\text{cm}}^2$).

**Area of a circle = π × $r^2$.**

Note it's $r$ squared, not $2r$. So if $r=7$, area = π × 49 (not π × 14).

Example $(r=7$ cm, π = $\frac{22}{7}):A=\frac{22}{7}\times 49=22\times 7=154{\text{cm}}^2$.

Example $(r=10$ cm, π ≈ 3.14): A ≈ $3.14\times 100=314{\text{cm}}^2$.