The object of this activity is to allow students to see how often pi is used in formulas and to match the name of the formula with the actual formula. Students will color the outside sections the same color as the matching formula section. (See answer key.) A few fun facts are thrown into the picture and students should feel free to color those sections as they wish. After all is said and done, ask the students what do all of the shapes have in common. They of course should say circles. Students may know that an ellipse is not a circle, but has similar features as a circle. If students do not know all of the formulas, they should still be able to figure this out by a process of elimination. They should not look up formulas on the internet or in their book. Hang the colorful pictures in your room or hallway to remind everyone that pi is special enough to have it’s own day!