## Circle Tool

In the Investigation section, collect data points by dragging the radius to various lengths, and the click the "Add to Table" button to record the data in the table. By default, the radius, diameter, circumference and area are shown in a table.

- Clicking on the
**x/y**button allows you to examine the relationship between any two measures. - Clicking on the graph button will take you to a graph of the data. You can
plot any of the four measures on the
*x*-axis against any of the four measures on the*y*-axis.

In the Problems section, determine the answer to each question using the applet, a calculator, or paper and pencil. And don't forget to indicate the proper units!

- …radius and diameter?
- …radius and circumference?
- …diameter and circumference?
- …radius and area?

Some relationships can be discovered using the **x/y** button. Others will
require more investigation, but the graph should give you some insight.