THE MATH BRAIN

PI

3.141592653589793238462643383279502884197169399375105820974944592307816406286 208998628034825342117067982148086513282306647093844609550582231725359408128481...

PI (π) goes on

FOREVER

TO VIEW THE FIRST 100,000 digits of PI (π), YOU SHOULD GO TO...
http://www.geom.uiuc.edu/~huberty/math5337/groupe/digits.html

IF YOU DO HAPPEN TO BUMP INTO π IN MATH CLASS,
All you have to do is use 3.14, or for extra credit, 3.1415.

Remember this...

And these.

Circumference: π x diameter (d)
Area: π x radius squared

EXAMPLES

If the diameter is 1 inch, the circumference is...

d = 1
then, π (3.14) x 1 is 3.14
so the circumference is 3.14.

Try the same thing for area.

TRY THESE!

1 Pi to the 4th digit after the decimal point is (You can look at the top) ____.
2 A The circumference is π x the __________ (d)
B Area is π x the ________ (r) squared
3 If the diameter is 2 cm, then the circumference is ________.

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