Education Technology

Geometry: Exploring Diameter and Circumference

by Texas Instruments


  • Capture data to explore the relationship between the circumference and diameter of a circle
  • Use a scatter plot and a movable line to find an algebraic model for the relationship between the diameter and circumference of a circle


  • circumference
  • diameter
  • radius
  • slope

About the Lesson

This activity is designed to be student-centered, with the teacher acting as a facilitator while students work cooperatively. The time varies for the activity depending on whether the TI-Nspire document (.tns file) is provided for or created by the students.