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Thus Pi/12 = 15
that's if you're thinking of pi as radians, which you probably are, right? otherwise you can't find an exact value.
no, the question wants the EXACT value! start getting your CRAY supercomputers out, we got billions of digits to calculate!
Edit: Should come out as a fraction.
use pi=3.14 3.14/12=.2616
pi is not equal to 3.14.
using in trignometry pi =3.14 or 22/7
That's an approximation. It would be like saying that pi = 3.
Sorry to say it, but you can never write down the exact value of pi in decimal notation, or as a fraction. pi is proven to be irrational, which means that pi cannot possibly be equal to the value 22/7. It's just an approximation. It's fine to say "pi is approximately 22/7". But it's definitely wrong to say "pi is equal to 22/7".
At any rate, 22/7 has an infinite number of digits. Rounding off, 22/7 = 3.142857142857142857142857... But you also say that pi = 3.14? That should throw you some hints that you should rethink the idea that pi is equal to 3.14 and to 22/7, since they are different numbers to begin with...
I believe the formula needed is a sum and difference formula but I'm not sure.