1. **Problem:** Find the area and circumference of a circle with diameter 16.6 meters. 2. **Formulas:** - Circumference $C = \pi d$ where $d$ is diameter. - Area $A = \pi r^2$ where $r$ is radius. 3. **Calculate radius:** $$r = \frac{d}{2} = \frac{16.6}{2} = 8.3 \text{ meters}$$ 4. **Calculate circumference:** $$C = \pi \times 16.6 = 16.6\pi \text{ meters}$$ 5. **Calculate area:** $$A = \pi \times (8.3)^2 = \pi \times 68.89 = 68.89\pi \text{ square meters}$$ 6. **Final answers:** - Circumference: $16.6\pi$ meters (approximately $52.12$ meters) - Area: $68.89\pi$ square meters (approximately $216.29$ square meters)