Label the parts of a circle: radius, diameter, and circumference.

Let's solve this step by step.

We are given a circle with three labeled parts (indicated by arrows), and we need to match the correct terms — circumference, radius, and diameter — to each part.

Step 1: Understand the definitions

- Radius: The distance from the center of the circle to any point on the edge. It is usually shown as a line from the center to the circumference.
- Diameter: A straight line that passes through the center of the circle and connects two points on the edge. It is twice the length of the radius.
- Circumference: The total distance around the edge of the circle (the perimeter).

Step 2: Analyze the diagram

Looking at the image:

1. Green line (from center to edge): This is a radius because it goes from the center of the circle to the edge.
2. Red line (horizontal, passing through the center): This goes from one side of the circle to the other, passing through the center — so this is the diameter.
3. Black arrow pointing to the outer edge: This points to the curved boundary of the circle — that is the circumference.

Step 3: Match the labels

Now assign the words:

- The green line → radius
- The red line → diameter
- The black arrow pointing to the edge → circumference

Final Answer:

- Top left box (pointing to green line) → radius
- Bottom center box (pointing to red line) → diameter
- Bottom right box (pointing to edge) → circumference

✔ So the correct labeling is:
- radius for the green line
- diameter for the red line
- circumference for the curved edge

This matches the standard parts of a circle.