Using GSP, create a circle and its diameter. Drag the circle to create different measurements. Use the tabulation tool to create a table of the various measurements taken. Be sure to include the circumference and the diameter.
Use the table to create a graph. The ordered pairs should represent the measure of the diameter and the measure of the circumference.
Explore the relationship between the radius and circumference; relate it to the properties of linear functions. Pay close attention to what the slope and the equation represents.
Given y = mx + b, use Algebra Expressor to explore the effect on the graph if we change the value of the coefficients.
Slicing cheese (expl. problems p. 59)
Circling the square (expl. problems p. 84)