Lesson to Teach the Basics of Pi

Pi Day - March 14

It's all just a ratio.. 3.14159

Multiple Choice

Pi Day is celebrated on March 14. (which was chosen because it resembles 3.14) What time does the official celebration begin?

• 3:14 PM

• 7:22 PM

• 1:59 PM

• 5:18 PM

Multiple Choice

The symbol for pi was introduced in the last _____ years.

• 100

• 200

• 300

• 400

Multiple Choice

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

• Savannah, Georgia

• Salt Lake City, Utah

• Frankfort, Kentucky

• Juneau, Alaska

Multiple Choice

What famous scientist was born on Pi Day in 1879?

• Archimedes
• Einstein
• Galileo
• Newton

What is this thing we call π  $\approx$   3.14159?

• π is the ratio of the Circumference to the diameter

• π ≈ 3.14 or  $\frac{22}{7}$   

• Use the site below to try this at home

• https://www.exploratorium.edu/snacks/cutting-pi

Multiple Choice

The circumference of a circle is C centimeters. The diameter of the circle is 13 centimeters. Which expression best represents the value of π?

• $$\frac{C}{6.5}$$

• $$\frac{6.5}{C}$$

• $$\frac{C}{13}$$

• $$\frac{13}{C}$$

Multiple Choice

The circumference of a circle is 25 centimeters. The diameter of the circle is d centimeters. Which expression best represents the value of π?

• $$\frac{12.5}{d}$$

• $$\frac{d}{12.5}$$

• $$\frac{d}{25}$$

• $$\frac{25}{d}$$

The Diameter Formula

 $C\ =\ \pi d$  

Multiple Choice

What is the circumference of a circle with a diameter of 5 feet?

• 15.7 ft

• 31,4 ft

• 78,5 ft

Multiple Choice

What is the circumference?

• 108π

• 18π

• 1088π

• 36π

Multiple Choice

What is the circumference of this circle?

• 3.14 cm

• 37.7 cm

• 24 cm

• 68.4 cm

The Radius formula

 $C\ =\ 2\pi r$  

Open Ended

What do you notices about  the 2 formulas used to find Circumference,  $$C\ =\ \pi d$$  and  $$C\ =\ 2\pi r$$  ? 

Multiple Choice

What is the circumference of a circle with a radius of 3 meters?

• 9.42 m

• 18.84 m

• 28.26 m

Multiple Choice

The radius of the circle is 9 meters.  What is the circle's circumference?

• 9 meters
• 28.26 meters
• 56.52 meters
• 18 meters

Multiple Choice

Find the circumference (to the nearest whole number)

• 88 in

• 44 in

• 116 square in

Explore more at these websites

• https://www.exploratorium.edu/pi

• http://www.subidiom.com/pi/pi.asp

• https://solarsystem.nasa.gov/news/350/10-ways-to-celebrate-pi-day-with-nasa-on-march-14/