Discovering Pi/Welcome to Pi Day

Students explore pi. In this circle measurement lesson, students define and identify radius, diameter, circumference, and perimeter. Students work in groups to measure several plastic lids and record their findings. Students compare the relationship between the diameter and radius, then complete a "Circumference vs. Diameter" worksheet. Students explain the circumference formula based on their measurement comparisons. Worksheets and information about "Pi Day" are included.