1. **State the problem:** The diameter of a circle is 2 feet. We need to find the circumference of the circle in terms of $\pi$. 2. **Formula:** The circumference $C$ of a circle is given by the formula: $$C = \pi \times d$$ where $d$ is the diameter. 3. **Substitute the given diameter:** $$C = \pi \times 2$$ 4. **Simplify:** $$C = 2\pi$$ 5. **Answer:** The circumference of the circle is $2\pi$ feet. --- **Additional question:** Given a circumference of about 43.96 feet and diameter 7 feet, find the expression that best represents $\pi$. Using the formula: $$\pi = \frac{C}{d} = \frac{43.96}{7}$$ This fraction best represents the value of $\pi$ in this context.