The value of pi is widely accepted as approximately 3.14; however, as is true of all Irrational Numbers, when pi is expressed as a decimal, it has an infinite number of decimal places. To see pi expressed beyond its standard approximation, then please refer to the Related Link below.
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pi is approximately equal to: 3.141592653589793238462643383279...
When you multiply 12.8 times pi the exact answer is12.8 Pi, but you can round off the answer to40.192because pi is about equal to 3.14.
sin(pi/4) and cos(pi/4) are both the same. They both equal (√2)/2≈0.7071■
circumference = 2 x pi x radius which is the same as pi x diameter so the answer is pi.
Pi is about 3.14. Sometimes it is handy to use the mixed number 3 and 1/7 instead.