2. Introducing Pi Pi Day 3.14 March 14, 2015

3. What is Pi? Pi is the ratio of the circumference of a circle to the diameter. = Circumference of circle / Diameter

4. Facts of Pi Pi is an infinite decimal It cannot be returned as whole number fraction Pi never stops and never repeats So far, 10 trillion digits of Pi have been calculated

5. History of Pi Circles are found and used constantly in everyday life. By the year 2000 BC, man knew that the ratio of circumference to diameter was the same for all circles A reference to the Pi concept is found in Sacred Scripture (1 Kings 7:23; 2 Chronicles 4:2)

6. History of Pi…cont Ancient Babylonians, around the 18th century BC, had estimated pi to be approximately 3.125 It is thought that the ancient Egyptians used their knowledge of pi to help calculate the construction of their pyramids Archimedes (287-212 BC) was the first mathematician to theoretically calculate an approximate value of pi

7. Uses of Pi in real life Finding measurements of circles, cylinders, or spheres such as circumference, area or volume To calculate the amount of water in a pipe To calculate the diameter of a pipe To calculate the volume of fuel in tank (fuel tanks are usually circular cylinders) To calculate the area of a circle To calculate the circumference of a circle

8. Sources http://www.inwit.com/inwit/writings/history andodditiesofpi.html http://witcombe.sbc.edu/earthmysteries/EM Pi.htm Ask Dr. Math Pi necklace