On a piece of paper, draw 3 circles of different sizes. Use any method you like.

Use your circles to fill in the following:

- Estimate the length of the diameter and radius for each circle.
- Small circle: Radius______ Diameter______
- Medium circle: Radius______ Diameter______
- Large circle: Radius______ Diameter______

- What is the relationship between the radius and the diameter of each circle?
- The diameter is ______times the radius.

- Is that true for any circle?___Talk about it: Why do you think so?