2. Pi is...
• An infinite string of digits
• 3.1415926535897932384626433832795028841971693993...
• An expression (π)
• An irrational number
• The sixteenth letter of the Greek alphabet
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3. PI IS USED FOR:
• Finding the circumference and area of a circle, cylinder or
sphere
• Getting the area of a part of a circle
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4. TAU
‘Tau’ (pronounced ‘t-ow’) is
equal to 2π (pi multiplied by
2; 6.28318...). It is debated that
tau should replace pi, as many
problems require usage of
2π.
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5. FUN FACTS:
• With just 39 digits of pi, you can measure the circumference of
the observable universe, accurate to the width of a single
hydrogen atom.
• As of February 20th, 2013, scientists have discovered the digits
of pi to about 10 trillion digits.
• In 1897, pi was almost legally changed to 3.2 by a professor in
Indiana.
•
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