Activity 1  Read Sir Cumference and the Dragon
of Pi. Stop at page 15 and do
DISCOVERING PI ACTIVITY. After
completing DISCOVERING PI, finish reading Sir Cumference and the Dragon of
Pi.
Discovering Pi
Using a tape measure (centimeter
side), measure the circumference and diameter of 6 different objects.
Measure to the nearest ½ centimeter.
Record the object number, circumference, and diameter in the chart
below. Then, write the ratio of the
circumference to the diameter in the form of a fraction. Next, use a calculator to change the
fraction into decimal form, rounding to the nearest thousandth. After doing this for all 6 objects, find the
mean (average) of the 6
calculations.
Lid # 
Circumference 
Diameter 
Circumference 
Circumference 



Diameter 
divided by Diameter 






























Average
___________
Explain what pattern
developed when you divide the circumference by the diameter?
A commonly used approximate
for pi is
3.14. How close is your average to pi ? Find the difference between your average and
pi.
Writing
Prompts for Discovering
Pi
1. In mathematics,
Pi is approximately 3.14159. Explain in
your own words how the value for pi is found.
2. Pi is an irrational number.
a) Write 2 or more sentences explaining what it
means for a number to be irrational.
b) Give an example of a number that is rational and write
a sentence explaining why it is rational.
3 Which
approximate is more accurate for pi:
22/7 or 3.1? Explain why. Use complete sentences.
Activity 2 – FAVORITE PIE GRAPHS. This activity takes about 60 minutes. Have students vote for their favorite type
of pie. Find the percent of the class
that voted for each type of pie.
Calculate the percent of 360 degrees for each “slice”. Have the students make a PIE GRAPH of the
results. Make the graph inside of a pie
tin.



Favorite Pie Data 





Fraction 
Percent 
Percent
of 360 

Cherry 















Pumpkin 















Chocolate 















Apple 















Coconut 















Pecan 















Other 























Total 







Activity 3 – Complete the PI DAY SCAVENGER HUNT. http://www.expage.com/piinfo
Pi
Day Internet Scavenger Hunt
Math Glossaries
1) What is the circumference of a
circle?
2) What is the diameter of a circle?
The Story of Pi
3) What is PI the ratio of?
4) What value of PI did the Egyptians obtain
2000 years before Christ?
5) What value of PI did the Babylonians obtain?
6) Where in the Bible is there an indication of
the value of PI?
What was this approximate value?
7) Which fraction
is closest to the actual value of PI…..
337/120 or 22/7 or 355/113 ?
What is the decimal equivalent of it (to 8
decimal places)?
8) What does it
mean to “square a circle”?
Birthday in Pi
9) Find your birthday in PI. Type in your date of birth and record the
location.
Joy of Pi
10) In the year
1997, D. Takahasi and Y. Kanada calculated PI to 51,539,600,000 decimal
places. What type of computer did they
use?
Where did they do
the calculation?
Planet Pi
11) Is PI a rational or irrational number? Explain why.
12) What is PI to 30 decimal places?
13) What is the
symbol for pi? Who first used
it and when?
What Swiss mathematician was it
popularized by?
Web Page Dedicated to Pi
14) Who were the
first people known to find a value for pi?
When was it?
15) In the first
one million digits of pi, how many threes are there?
How many nines?
16) People once
thought that trying to square a circle was an illness. What was the name of the illness?
17) What was the
most inaccurate version of PI? Explain
who, when, and what the value was?
18) Who memorized
42,195 digits of PI on Feb. 18, 1995?
Where was the person from?
Online Dictionary
19) You can memorize PI by using things called
“mnemonics” What is a “mnemonic?
Activity
4 – Draw a picture of a circle with different parts labeled (diameter, radius,
chord, arc, etc). Answer questions
about what each of them is and the relationships among them. Find this information on the Internet.
Go to the Math.com
website. Scroll down until you see the
picture of the circle. Below the circle
are the words radius, chord, diameter, arc, and semicircle. Click on each (one at a time) then label the
parts on the circle below.
Go to the bottom
of the page and click NEXT. Use
the information of that page to answer the following questions.
1) What is perhaps the “most seen” shape?
2) By definition, what is a circle?
3) If
a plate is not a circle, what is it? What
part of the plate is a circle?
4) What
is a circle name by?
5) What
is the plural of “radius?
6) What
is the relationship between diameter and radius?
7) What
is a “chord”?
8) How
many degrees does a circle contain?
9) Define: minor arc:
major
arc:
semi
circle:
10) What
is the circumference of a circle?
11) What
are concentric circles?
12) When
you slice a round pizza, you usually slice along a ___________?
13) What
is the name of the tool used to construct circles?
Go to Math
Goodies.com website to answer the following questions.
1) The distance around a circle is the
_____________.
2) What is pi the ratio of?
3) How is the relationship between diameter and
radius expressed?
4) What is the formula for area of a
circle?
Activity 5 – Have the students make a crisscross
puzzle or word search puzzle using pi and circle related words at http://www.discoveryschool.com/puzzlemaker
.
Activity 6 – Make a PI CHAIN. Use 10 different colors of construction paper, one for each digit
0 – 9. Give each student 10 digits of
pi to make the chain for, using the colored paper to represent the digits. For example, if 1=red, 2=blue, 3=green,
4=yellow, etc…, 3.141 would be green, then red, then yellow, then red. Connect the 10 digit chains together to form
a long PI CHAIN. See http://www.mathwithmrherte.com
for more information.
Directions for Pi Chain
1) Get the next 10 digits of pi.
2) Select the colors you need for the digits.
3) Cut strips of paper 9inches by 1.5 inches.
4) Connect the colored strips in the order of the digits.
5) Do NOT
glue the last link. Paper clip it
together and attach the paper with your digits of pi.
6) Your
chain will be connected to the previous 10 digits and the next 10 digits of pi.
(That is why you don’t glue the last link, so it can be connected to the next
10 digits of pi.)
Activity 7 – Show the video GOING AROUND IN CIRCLES. Have the students answer the questions as
they watch the movie.
Video
 Going Around in Circles
1) A
curve is line that is constantly changing its __________.
2) A
flexible line hanging from 2 supports is called a __________ curve.
3) Name
2 types of curves in a roller coaster.
__________ ________.
5) Why
were roller coasters redesigned from looptoloops to teardrops?
4) What is the distance from the center of
a circle to the edge of a circle, that is the fixed distance from the center
called? _________
6) Part of a circle is called an ______?
7) How many degrees in a circle? _________
8) The distance around a circle is the ____________
and the distance across a circle is the __________.
9) Archimedes discovered that the
circumference of a circle was a little more than _____ times the diameter. He expressed this comparison with an
approximate ratio of _____ to ______.
10) Pi rounded to the nearest hundredth is
3._____. What is the symbol for PI?
11) Pi is the ratio of ______________ to
_________.
12) The formula for the circumference of a
circle is C = ________.
13) What is the approximate distance all the
way around the world?
14) A circle that fits just inside of a
square has a circumference of about what fraction of the perimeter of the
square? ________
15) What shape do the 12 sections of the
lemons placed together resemble?
16) What is the formula for the area of a
circle?
17) Why are the left tires of a wing sprint
car smaller than the right tires?
18) How many days are in the moon’s cycle?
Activity 9 – Have students bring in pies to share
with the class on
PI DAY.