No, it is not.
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3.14 is a rational number pi is not. pi is not 3.14
No 10*pi is not a rational number because it can't be expressed as a fraction
Minus pi. Or minus pi plus any rational number. Here is how you can figure this out (call your unknown number "x", and let "r" stand for any rational number):x + pi = r To solve for "x", simply subtract pi from both sides. That gives you: x = r - pi
It is irrational, just like pi
No because pi still remains as an irrational when squared.