After School Treats
After School Treats
Search Site: 
After School Treats kids
After School Treats kids
Math Fact Games
Time & Money
Story Problems
Place Value
Properties & Orders
Fractions & Decimals
Ratios & Percentages
Rounding & Estimating
Squares, Primes, Etc.
Math Graphics
Probability & Statistics
Math +


AfterSchoolTreats Home   |   Math Home   |   Email A Treat   |   Site Map
Facebook   |     |  

Geometry        < Previous        Next >



3.14159265358979323846264338327950288 . . . etc.


Today's Snack: Pi is an endless number. Make yourself an endless supply of popcorn in a tall bowl. You'll keep reaching and reaching, and it never seems to . . . uh oh, a bowl of tasty popcorn might come to an end after all! Enjoy ice water with a twist of lemon in it along with your popcorn treat.





Flexible measuring tape, such as seamstresses use

Scratch paper and pencil | several circular items



"Pi" (pronounced like apple "pie") is a Greek alphabet letter. In symbol form, it looks like this:



You remember that the circumference of a circle is the distance around the circle, and the diameter is the distance across the center of a circle.


What do those have to do with pi? Plenty.


The ancient Greeks figured out that if you divide the circumference of any circular object by its diameter, it'll always turn out to be a number around 3.1416.


The numbers after the decimal point actually go on into infinity, with no particular pattern repeat, so it's a fascinating situation. Knowing about pi is really important for understanding the relationships between objects in everything from manufacturing design to space exploration.


For example, did you know that the Earth's circumference is about 24,902 miles, and its diameter is about 7,927 miles? If you round the diameter up to 8,000 miles, you can see that the circumference is a little bit more than three times as long as the diameter. Use a calculator, and you'll see just how close it comes to pi - it's "off" by a couple of thousandths only because we haven't given you the exact mileage, to the decimal points. But you can see the relationship.


Want to see for yourself? OK, take a flexible measuring tape, a piece of scratch paper and a pencil, and let's make a chart. We've suggested some circular objects to get you started, but bet you can think of many more to measure. Note that many measuring tapes show inches as well as millimeters and centimeters, so take your pick. Just be sure to use the same unit of measurement (inches, feet, millimeters or centimeters) for both measurements - the object's circumference as well as its diameter:


Round Object Circumference Diameter Circumference






Jar lid



Pop can



Dinner plate









Car tire



More ideas:

























By Susan Darst Williams Math 2010

Geometry        < Previous        Next >
^ return to top ^
Read and share these features freely!
Thanks to our advertisers and sponsors



Your Name Here! 

(Your business's contact info and 

link to your website could go here!) 


Contact Us to inquire about advertising opportunities on After School Treats!  


  , All Rights Reserved.

Website created by Web Solutions Omaha