Happy Pi Day

1
Happy Pi Day

• March 14
• (3.14)

2
We Wish You a Happy Pi Day

• We wish you a happy Pi DayWe wish you a happy Pi
  DayWe wish you a happy Pi DayTo you and to all
• Pi numbers for youFor you and for allPi numbers
  in the month of MarchSo three point one four!

3
Pi Activity Websites

• www.TeachPi.org
• www.math.com/tables/constants/pi.htm
• www.mobot.org/education/megsl/pi.
• html

4
Digits of Pi

• First 100 digits
• 3.1415926535 8979323846 2643383279 5028841971
  6939937510 5820974944 5923078164 0628620899
  8628034825 3421170679 ...

5

• A Haiku poem is a type of Japanese poetry. It is
  three lines long.
• The first line is five syllables,
• the second, seven
• the third, five. Create your own Pi-ku poem
  following the criteria above.

6
Examples

• The sky is so blue
• It is more blue than waterBirds fly in the sky
• Unending digits...Why not keep it simple,
  likeTwenty-two sevenths?

7
Area of a Circle

• Divide a circle into a series of pie-shaped
  wedges that resemble triangles.
• Discuss the formula for the circumference of the
  circle
• Cut the circle into triangles and rearrange them
  in alternating directions
• Figure is a parallelogram. As the number of pie
  pieces gets larger, the figure gets closer and
  closer to a rectangle. The base of the rectangle
  is about one-half the circumference. The height
  is the same as the radius of the original circle,
  r.
• Discuss formulas.

Pages 338-339 of textbook
8
Discovering Pi

• In small groups, carefully measure the
  circumference and diameter of different circles.
• Measure both the circumference and diameter and
  record them in a table. To measure circumference,
  wrap string once around the object and then
  measure the length of the string.
• Compute the ratio of the circumference to the
  diameter for each circle measured.
• Discuss the results with your group members.

Page 369 of textbook