Your teacher will give your group two circles of different sizes.

1. For each circle,

   1. Use the grid squares to determine the diameter of the circle.
   2. Estimate the area of the circle.
   3. Record your measurements in the first two rows of the table.

   diameter (cm)	estimated area (cm2)

2. Plot your diameter and area 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 5 through 25, in increments of 5, are indicated. The vertical axis is labeled "area, in square centimeters, and the numbers 50 through 300, in increments of 50, are indicated.

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

4. Earlier, you graphed the relationship between the diameter and circumference of a circle. How is this graph the same? How is it different?