Irrational Numbers have been known since very early times. For example, it was recognised that the length of the diagonal of a unit square was not a rational number. There is, therefore, no specific date.
Probably the ancient Egyptians who discovered that the diagonal of a unit square was not a rational number. And then discovered other such numbers.
Type your answer here...square root of two or pie ?
William Shanks is not known to have created any number - rational or irrational. He did calculate pi to a greater degree of accuracy then previously but the number pi had been discovered around 4 thousand years before Shanks. Therefore it can hardly be said that he discovered it.
Pi is the value of a circle's circumference divided by its diameter and its true value has never been discovered because it is an irrational number
An irrational number.
No. The sum of an irrational number and any other [real] number is irrational.
The sum of a rational and irrational number must be an irrational number.
No, 3.56 is not an irrational number. 3.56 is rational.
rational * irrational = irrational.
-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
At least one of the factors has to be irrational.* An irrational number times ANY number (except zero) is irrational. * The product of two irrational numbers can be either rational or irrational.