No it does not exactly equal 3. Pi (that's how you spell it in math terms) exactly equals 3.14159265
*just a note Pi does not in fact equal exactly 3.14159265 it is an irrational number therefor has no exact value although its decimal places will continue infinitely :)
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tan(pi/3) = tan (60 degrees) = 1.732 which is square root of 3
point 3 inches is exactly equal to 0.3 inches.
You start of with a whole pie and if you cut in two equal pieces you have two half pies. If you cut the two half pie pieces in half you end up with 4 equal pieces of the original pie and these are called quarters. So to get a half you divide by 2 To get a quarter you divide by 4 Thus 12/4 = 3 or 4*3=12 Thus a quarter of 12 is 3.
Pi does in fact equal 3.14159.
It is 16666666667/10000000000, which is nearly, but not exactly, equal to 5/3.