Question: Using $\pi$, not an approximation, what is the circumference of a circle with a radius of $6.55$ cm? Round to the tenths place.
1. **State the problem:** We need to find the circumference of a circle with radius $r = 6.55$ cm using $\pi$ exactly, then round the result to the tenths place.
2. **Formula:** The circumference $C$ of a circle is given by the formula:
$$C = 2 \pi r$$
3. **Substitute the radius:**
$$C = 2 \pi \times 6.55$$
4. **Calculate the exact expression:**
$$C = 13.1 \pi$$
5. **Approximate using $\pi \approx 3.1415926535$ to round:**
$$C \approx 13.1 \times 3.1415926535 = 41.1503...$$
6. **Round to the tenths place:**
$$41.1503... \approx 41.2$$
7. **Answer:** The circumference is approximately $41.2$ cm.
**Therefore, the correct choice is 41.2 cm.**