State which of the following statements are true and which are false :
A diameter of a circle divides the circular region into two parts, each part is called a semicircular region.

Answer

To determine whether the statement "A diameter of a circle divides the circular region into two parts, each part is called a semicircular region" is true or false, we can analyze it step by step.

### Step-by-Step Solution:

1. **Understanding the Circle**:
- A circle is a round shape where all points are equidistant from a central point called the center.

2. **Defining the Diameter**:
- The diameter of a circle is a straight line that passes through the center of the circle and touches two points on the circumference (the outer edge of the circle).

3. **Drawing the Diameter**:
- If we draw a diameter in the circle, it will split the circle into two equal halves.

4. **Identifying the Parts**:
- Each of these halves is called a semicircle. A semicircle is defined as half of a circle.

5. **Conclusion**:
- Since the diameter divides the circular region into two equal parts, and each part is indeed called a semicircular region, the statement is true.

### Final Answer:
The statement is **True**.