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THE BIG PICTURE

Happy Pi Day!

March 2023
by Ashley P. Taylor • Illustration by Jon Liddell
Image showing different kinds of pie such as pecan, strawberry, and fruit tart

Circumference

March 14 (3/14) is Pi Day, the day we celebrate π (3.14)! Pi represents the ratio of the circumference of a circle to its diameter, and it is one of math’s best-known constants!

Find the circumferences of pies for sale. Use 3.14 for pi. Record your work and answers on our answer sheet.

Strawberry-cranberry pie

Circumference:

Mini key lime pie

Circumference:

Fruit Tart

Circumference:

Pecan pie

Circumference:

The pecan pie is cut into 8 equal slices. What's the length of the crust of each slice?


NEED A HAND?

Circumference (C) is the distance around a circle's perimeter. The formula to find circumference is:

C = π × d

Diameter (d) is a line that passes from one side of a circle to the other through the center.

Illustration showing the diameter of a circle

Find the circumference of a circle with a diameter of 12 in.

C = π × d

C = 3.14 × 12 inches

C = 37.68 inches

Geometry
Two-Dimensional Shapes, Perimeter

Teaching Resources
Text-to-Speech