Based on the image you uploaded, it appears that the task is to match geometric terms with their correct definitions. Here's the proper matching for the terms and definitions provided:

1. Circle → "The set of all points in a plane that are at a given distance from a given point in the plane."
2. Diameter → "A chord of a circle that contains the center of the circle."
3. Congruent Circles → "Circles that have equal radii."
4. Concentric Circles → "Two or more circles that lie in the same plane and have the same center."
5. Radius → "A segment joining the center of a circle to a point on the circle."

Would you like further details on any of these concepts?

Here are five related questions for deeper understanding:

1. How do you calculate the circumference of a circle using the radius?
2. What is the relationship between the diameter and the radius?
3. How can you prove two circles are congruent?
4. What are some real-world applications of concentric circles?
5. How does the radius affect the area of a circle?

Tip: The radius is always half the diameter, and both are essential for calculating properties like circumference and area.