- (3) different size circles -small, Medium, and Large (bottle caps or other circles)
- yarn or string
- calculator (optional)
- paper and pencil
- Introduce or review the terms diameter and circumference.
- Have students measure the diameter of the 1st circle with a ruler and record the measurement.
- Ask students how they should measure the circumference of circle 1. Elicit from the students that they should use string, then measure the string.
- Have students measure the circumference of the 1st circle with the string, then measure the string with their ruler. They need to record the measurement.
- Have students divide the circumference by the diameter.
- Continue with the same procedure to measure circle 2 and 3.
- In each case, when the students divide the circumference by the diameter, they should get approximately 3.14 or 3 1/7 (or 22/7).
- Discuss with students how this happens with ALL circles.
- Introduce the term Pi and the Symbol for Pi.
10. Of course having some tasty pie would be a great wrap up for this activity!
Don't forget to celebrate Pi Day on March 14 (3-14)!!!