A circle divide the plane into three parts .

Answer

To determine whether a circle divides the plane into three parts, we can analyze the situation step by step.

### Step-by-Step Solution:

1. **Understanding the Circle**:
A circle is defined as the set of all points in a plane that are at a fixed distance (the radius) from a central point (the center).

2. **Visualizing the Plane**:
Imagine a flat surface, which we refer to as the plane. When we draw a circle on this plane, we need to consider how the circle interacts with the plane.

3. **Identifying the Regions**:
When a circle is drawn on the plane, it creates three distinct regions:
- **Interior of the Circle**: This is the area inside the circle.
- **The Circle Itself**: The line that forms the boundary of the circle.
- **Exterior of the Circle**: This is the area outside the circle.

4. **Counting the Parts**:
Now, we can count the parts:
- The interior part (inside the circle).
- The boundary part (the circle itself).
- The exterior part (outside the circle).

Thus, we have three distinct parts created by the circle.

5. **Conclusion**:
Since we have identified three parts, we can conclude that the statement "A circle divides the plane into three parts" is true.

### Final Answer:
The statement is **True**. A circle divides the plane into three parts: the interior, the boundary, and the exterior.