an approximation
Think of pi as infinity. It never ends. You might mean "3.14" as an approximation of pi, though.
7/8 is pretty close (less than .1% approximation)
0.3333... (keep going depending on how close an approximation you want).
It allows you to make an approximation for the final answer quickly. When the detailed answer has been calculated, if it is very different from the approximation then it is likely that a mistake has been made in either the approximation or the detailed calculation - you have no way of knowing which is wrong. Note that there are circumstances where an approximation can be very different from the detailed calculation but both are correct. Division by a number close to zero can cause such problems.
The approximation wasn't exact, of course, but it was close enough.
Yes, to a very close approximation.
an approximation
an approximation
double and add 10% for a close approximation.
Approximation
Think of pi as infinity. It never ends. You might mean "3.14" as an approximation of pi, though.
~37.6991118431 It would, of course, go on forever, but that's a close approximation.
7/8 is pretty close (less than .1% approximation)
0.3333... (keep going depending on how close an approximation you want).
the fraction 22/7 is a close approximation to 3.14159265
If you mean for wire, the following link has both an exact formula, and a close approximation (with a simpler formula): http://en.wikipedia.org/wiki/American_wire_gauge#Formula