Circles

Duane Habecker, Tutorified.com, Dec 14, 2019

All about pi, circumference, and area. Intended for students ages 11 - 14.


  • 1. Finding pi
  • 2. Rolling a circle to find pi
  • 3. Circle circumference
  • 4. Area formula for circles
  • 5. Exploring with the area of circles
  • 6. Practice: Using 3.14 to find area and circumference
  • 7. Practice: Using 22/7 to find area and circumference

1.

Finding pi

Use the green dot to change the size of the circle. Notice that the diameter and the circumference of the circle change, too. How do the diameter and circumference compare with each other? Use the "Show/Hide ratios" checkbox to find out.
Finding pi
How many diameters need to be laid end-to-end to equal a circumference. Is this answer the same for ANY circle?
– Duane Habecker

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