Your teacher will give you two circular objects.

1. Measure the diameter and the circumference of each circle to the nearest tenth of a centimeter. Record your measurements in the first two rows of the table.

   object	diameter (cm)	circumference (cm)

2. Plot your diameter and circumference values on the coordinate plane. What do you notice?

   

   A coordinate plane with the origin labeled "O". The horizontal axis is labeled "diameter, in centimeters," and the numbers 0 through 25, in increments of 5, are indicated. The vertical axis is labeled "circumference, in centimeters," and the numbers 0 through 80, in increments of 10, are indicated.

3. Find out the measurements from another group that measured different objects. Record their values in your table and plot them on your same coordinate plane.

4. What do you notice about the diameter and circumference values for these four circles?