1. Let's clarify the concept of "exact radius." When a problem asks for the exact radius, it means you should provide the precise value, including any decimals or radicals, without rounding. 2. However, if the problem specifically instructs you to give only the whole number part (the integer part) of the radius, then you should truncate or floor the value accordingly. 3. In general, unless explicitly stated, always provide the exact value, which could be a decimal or an expression involving square roots or fractions. 4. For example, if the radius is calculated as $\sqrt{50}$, the exact radius is $\sqrt{50}$ or simplified to $5\sqrt{2}$, not just 7 (the whole number part). 5. If the problem says "give the radius as a whole number," then you would provide 7 in this case. 6. Always read the problem instructions carefully to know whether to give the exact value or just the whole number part. In summary, "exact radius" means the full precise value, not just the whole number part, unless the problem states otherwise.