https://file.aiquickdraw.com/mathbot/file/173020472208107bzfak4.jpg

Let's analyze the image step-by-step to answer each part of the question. The diagram shows a circle with center \( C \) and the diameter \( \overline{AB} \). Point \( D \) is also marked on the circumference.

### Solution:

1. **Radius**: 
   - The radius is the line segment from the center \( C \) to any point on the circle. Possible answers are \( \overline{CA} \) or \( \overline{CB} \).

2. **Central Angle**:
   - A central angle has its vertex at the center of the circle and is formed by two radii. Here, \( \angle ACB \) is the central angle.

3. **Semicircle**:
   - A semicircle is an arc that represents half of the circle, subtended by a diameter. Since \( \overline{AB} \) is the diameter, the arc \( AB \) represents the semicircle.

4. **Minor Arc**:
   - A minor arc is the smaller of the two arcs between any two points on the circle. Here, \( \overset{\frown}{AD} \) is the minor arc (smaller arc between \( A \) and \( D \)).

5. **Major Arc**:
   - A major arc is the larger of the two arcs between any two points on the circle. Here, \( \overset{\frown}{ABD} \) is the major arc (larger arc that goes from \( A \) to \( D \) passing through \( B \)).

### Summary:
1. **Radius**: \( \overline{CA} \) or \( \overline{CB} \)
2. **Central Angle**: \( \angle ACB \)
3. **Semicircle**: Arc \( AB \)
4. **Minor Arc**: Arc \( AD \)
5. **Major Arc**: Arc \( ABD \)

Would you like more details on any of these parts, or do you have any specific questions?

### Related Questions:
1. What is the formula for the length of an arc given the radius and central angle?
2. How can you calculate the area of a sector based on a central angle?
3. What is the relationship between a central angle and the arcs it subtends?
4. How does the length of the radius affect the size of a circle?
5. What are the differences between minor and major arcs?

### Tip:
Remember, in any circle, a diameter divides the circle into two equal semicircles, and each semicircle represents half of the circle’s circumference.

In the figure at the right, point O is the center of the circle with AB as the diameter. Name the following: Radius, Central Angle, Semicircle, Minor Arc, Major Arc.

Learn how to identify key elements of a circle, including the radius, central angle, semicircle, minor arc, and major arc, based on a given diagram with a diameter and center.

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