Pi Day Fun

Pi Day Fun

Let's Celebrate!

What is Pi Day?

• A holiday made up to make you think more about math?

• An international holiday celebrated on 3/14 (in the US) because it's like 3.14

• A celebration of the power of a constant representing the circumference of a circle to its diameter?

• A reason to celebrate pie?

• All of these :)

What IS pi anyway?

Anciently, mathematicians determined that there was a relationship between the diameter of a circle and its circumference. The distance around a circle was a tad more than 3 times as long as the diameter. π is a constant that is used in formulas related to circles.

Multiple Choice

1.How many digits are in the decimal equivalent of Pi?

• About 6,904,731

• No one really knows

• 6,904

• at least 50 Trillion

Could you do it?

Rajveer Meena holds the Guiness World Record for memorizing the most digits of pi. In 2015, he recited nearly 70,000 digits of pi. It took him almost 10 hours to do it.

Multiple Choice

Who was the first person to calculate pi (that we have records of)?

• Ancient Egyptians

• Archimedes of Syracuse

• Ancient Babylonians

• Chinese mathematician Zu Chongzhi

Multiple Choice

What is the seventh digit of pi?

• 2

• 4

• 6

• 8

Multiple Choice

What is pi a ratio between?

• Diameter:radius

• Diameter:circumference

• Circumference:radius

• Circumference:diameter

• Radius:circumference

Multiple Choice

 $\pi$  (Pi) is the 16th letter in which alphabet?

• Greek

• Roman

• Arabic

• Chinese

Multiple Choice

What famous mathematician was born on Pi Day?

• Euler

• Aristotle

• Einstein

• Bill Nye

Happy Birthday, Al!

Multiple Choice

When was the first Pi Day celebrated, and where?

• 3/14 1660 Athens

• 3/14/1972 Orlando

• 3/14/1490 Rome

• 3/14/1988 San Francisco

San Francisco Exploratorium

Larry Shaw organized a celebration, marching around their "golden seal of pi" 3.14 times while singing Happy Birthday to Einstein.

Multiple Choice

Which mathematician normalized the use of the Greek letter π as the notation for pi and what Arabic letters does it resemble?

• Euler TT

• Archimedes TT

• Aristotle TT

• Euripides TT

Multiple Choice

What mathematical formulas depend on pi?

• Area of a circle

• Surface area of a cone

• Surface area of a sphere

• Volume of a cylinder

• All of these

Multiple Choice

What U.S. city has a zip code containing the first 5 digits of pi?

• Savanna, GA

• Charleston, SC

• Wilmington, DE

• Jacksonville, FL

Multiple Choice

When you use the  $\pi$ button on your calculator, what estimation is used?

• 3.14

• 3.1415

• 3.141562658979

• 3.1415926535897932384626433832795

Multiple Choice

Why do Europeans celebrate Pi Day on July 22nd?

• They hate American holidays.

• They calculate pi using the metric system.

• They write their dates backwards from the way we do.

• None of these.

Multiple Choice

What do you get when you divide the circumference of a pumpkin by its diameter?

• A Jack-o-lantern

• Too much mathing

• Smashing Pumpkins

• Pumpkin Pi!

Poll

In what way have you ever celebrated Pi Day?

• Pie-eating Contest

• Tell jokes about pi.

• Memorize digits of pi.

• Sing Pi - M - C - A

• Never celebrated??

Cutting Pi Materials

• Circular object(s) like plates, cans, rolls of tape, coin or bottle cap

• String

• Ruler

• Scissors (optional)

• Calculator

• Paper and pencil

Cutting Pi Procedures

• Measure the diameter of each object and record it

• Wrap the string around the outside of the circle, measure it and record it.

• Divide the circumference by the diameter for each pair

• Share your value with the group.

And the winner is . . . .

I'll call you and let you choose your prize $3.14 in cold hard cash or an actual pie (based on location and availability).

Punny Pi Day Participants

From all of us to all of you,

Happy Pi Day!