University of Regina (Canada)
University of Regina: Math Central: Archimedes's Approximation of Pi
Students explore the process used by Archimedes to approximate pi. The activity enables students' to come to their own approximations of pi when bounded by limits.
Texas Instruments
Texas Instruments: Approximation of Pi
Students will measure the circumference and diameter of a variety of different circles. They will graph the class' values of (d,c) on the coordinate plane and use linear regression to approximate pi.