Teachers, save “Pi Day- What is Pi?” to assign it to your class.

Did you know...that the number Pi is the ratio of a circle’s circumference to it’s diameter? That means you can find the measure around any circle and divide that number by the distance across the circle, and it will equal the special number Pi! Let’s try it by using an emoji smiley face as our measuring unit. 1. Using the template provided, move the smiley face labels around the outside of the circle. Count the total used and write this number next to “C.” 2. Using the template provided, move the smiley face labels to go across the center of the circle. Count the total used and write this number next to “D.” 3. Label the circumference and diameter using the drawing tool. 4. Using a calculator, determine Pi by dividing the circumference by the diameter. Write this number next to the equation Pi = C/d=____ 5. Is your number for Pi =3.14? If not record explaining why it is not. 6. CHALLENGE: Find a lid, measure the circumference, divide it by the diameter. Does it = 3.14?