**Happy Pi Day**

π =3.141592653589793238462643338327950288419716939937.......

**Facts About Pi :**

1. Pi is the ratio of circumference of the circle to diameter of the same circle. Pi = Circumference / Diameter= 3.1415926535897......

2. Pi is not equal to the ratio of any two integers, its approx value is taken i.e. 22/7=3.14159265..

3. 3.14.......... is the random value of Pi which has never proved.

4. 14th March 2018 is the 30th Anniversary of Pi.

**History of Pi :**

By measuring circular objects, it has always turned out that a circle is a little more than 3 times its width around. In the Old Testament of the Bible (1 Kings 7:23), a circular pool is referred to as being 30 cubits around, and 10 cubits across. The mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was approximately 22/7. The symbol (Greek letter “π”) was first used in 1706 by William Jones. A ‘p’ was chosen for ‘perimeter’ of circles, and the use of π became popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737. In recent years, Pi has been calculated to over one trillion digits past its decimal. Only 39 digits past the decimal are needed to accurately calculate the spherical volume of our entire universe, but because of Pi’s infinite & patternless nature, it’s a fun challenge to memorize, and to computationally calculate more and more digits.(Source: www.piday.org)

**Pi in Geometry :**

The number pi is extremely useful when solving geometry
problems involving circles. Here are some examples:

**The area of a circle:**

A = πr

^{2}
Where ‘r’ is the radius (distance from the center to the
edge of the circle). Also, this formula is the origin of the joke “Pies aren’t
square, they’re round!”

**The volume of a cylinder:**

V = πr

To find the volume of a rectangular prism, you
calculate length × width × height. In that case, length × width is the area of
one side (the base), which is then multiplied by the height of the prism.
Similarly, to find the volume of a cylinder, you calculate the area of the base
(the area of the circle), then multiply that by the height (h) of the cylinder.^{2}h**src= www.cnn.com & www.piday.org**

# Pi Day Images :

— Mrs. Chong (@chonglinda4) March 8, 2018

Are you ready for #PiDay on 03.14? Get the celebration started early with a challenge from @NASAJPL_Edu! https://t.co/qpPxlPtcSi pic.twitter.com/deTvsnPO70— NASA Education (@NASAedu) March 9, 2018

PiDay is just around the corner...here’s a π-related fact courtesy of Martin Gardner! #PiDay pic.twitter.com/13ga5g26q9— Chris Smith (@aap03102) March 11, 2018

Need Pi Day inspiration? What are some ways you think your students will reason about this WODB? https://t.co/CSz89EkF7h #LearnWithIM pic.twitter.com/hRBcf6w5ks— Illustrative Math (@IllustrateMath) March 11, 2018

Pi Day is right around the corner, and we’ve got you covered with these 7 classroom resources to help students explore pi and math-related concepts. #PiDay https://t.co/mYvEKEbKl8 pic.twitter.com/COJtkETstV— edutopia (@edutopia) March 5, 2018

Celebrate Einstein's Birthday! - WRHS Pi Day Scavenger Hunt - Wed. 3/14. #Wahconah pic.twitter.com/o6Pouh0RBU— Melinda Walton (@mwaltonA8) March 12, 2018

Celebrating Pi Day! Lots of pies and blanket ties in Altman and Brock’s classes!🥧➕❤️ pic.twitter.com/Ra3UO5s2kQ— Sue Altman (@suekaltman) March 13, 2018

It’s almost time for the coolest (and yummiest) mathematical day of the year – #PiDay, March 14th! https://t.co/E05VOLHVlP pic.twitter.com/Ekha5OtTzi— Grand Traverse Pie (@GTPie) March 9, 2018

# Pi Day Videos :

— Scientific Mayhem (@ScientificMayhm) March 10, 2018

In honor of Pi Day, anyone who renews their lease on 3.14 will be able to pie Michelle or any other team member of their choice in the face! Call the office to renew today! pic.twitter.com/jPtS2dG9Nq— AXIS (@Axis_LuxeApts) March 13, 2018

— Todd Wiencek (@WiencekTodd) March 13, 2018

🥧 It's the most wonderful, mathematical time of the year! Next Wednesday, March 14th, join us for the 31st annual SF Pi Day Celebration at the Exploratorium—featuring π-themed activities, rituals, antics, and plenty of pie! Info: https://t.co/mTN1gnyiWY #PiDaySF #exploratorium pic.twitter.com/FXy7xPrGWW— Exploratorium (@exploratorium) March 12, 2018

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