1. **Stating the problem:** Nadine attempted to draw a circle with center at point B, but the circle is incomplete and not fully closed. 2. **Understanding the circle definition:** A circle is the set of all points in a plane that are at a fixed distance (radius) from a fixed point (center). 3. **Key rule:** To draw a circle correctly, every point on the circumference must be exactly the same distance from the center point B. 4. **Identifying the error:** The incomplete circle suggests that Nadine did not maintain a consistent radius from point B while drawing. 5. **Explanation:** If the radius varies or the drawing tool is not fixed at B, the circle will not be closed or symmetrical. 6. **Conclusion:** Nadine's error was not keeping the radius constant from the center B, resulting in an incomplete and incorrect circle. Final answer: Nadine did not keep the radius constant from the center B, causing the circle to be incomplete and not properly closed.