Sophie and Jacob Period 4 Mrs' McMahon Math

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Sophie and Jacob Period 4Mrs.
McMahonMath
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Who came up with the pi symbol?

• The modern symbol for pi ? was first used in
  1706 by William Jones.
• Pi was chosen as the letter to represent the
  number 3.141592... because the letter ? in
  Greek, pronounced like our letter 'p', stands for
  'perimeter'.

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Why is pi an irrational number?

• One way to interpret the fact that pi is an
  irrational number is to say that there is no
  exact relationship between a circle's diameter
  and circumference.You can estimate it as
  accurately as you like, but you can never know it
  exactly.
• Pi is an irrational number, which means that it
  cannot be expressed as a fraction a/b, where a
  and b are integer, and b does not equal zero. It
  is a decimal representation that never ends or
  repeats.

3.14159265358979323846
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How might the world be different if pi was never
discovered?

• There would have to be a different formula for
  finding area and circumference of a circle.
• It might be impossible to figure out an accurate
  formula so the circle as we know it may not exist
  resulting in changes in the world such as
• Square man hole covers instead of circles.
• Tires on cars may not be even, which causes rough
  driving.
• Storage containers may only come in rectangles
  and squares.
• Circle earrings may not exist.
• Hula hoops and yo-yos would not work properly.
• The pulley would have never been invented, which
  would change the way weight machines would work.
• And the list goes on
• What suggestions or ideas do you have???

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LETS HAVE SOME SING-A-LONG FUN
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SOME FUN PI DAY SONGS

• Oh Number PI
• Oh, number PiOh, number PiYour digits
  are unending,Oh, number PiOh, number PiNo
  pattern are you sending.You're three point one
  four one five nine,And even more if we had
  time,Oh, number PiOh, number PiFor circle
  lengths unbending.
• Oh, number PiOh, number PiYou are a
  number very sweet,Oh, number PiOh, number
  PiYour uses are so very neat.There's 2 Pi r and
  Pi r squared,A half a circle and you're
  there,Oh, number PiOh, number PiWe know that
  Pi's a tasty treat.
• (to the tune of "Oh Christmas Tree")

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SOME FUN PI DAY SONGS

• Pi Day Song
• RefrainPi day songsAll day long.Oh, what
  fun it is,To sing a jolly pi day songin a fun
  math classlike this. (Repeat )
• VerseCircles in the snow,Around and round
  we go.How far did we have to run?Diameter times
  pi! (Refrain )
• (to the tune of "Jingle Bells")

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SOME FUN PI DAY SONGS

• A live performance by The Derivatives' at a
  coffee house in December 2003. 
• Pi Song Live

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THANK YOU FOR YOUR ATTENTION!!!