( pi ) x ( 3/pi ) = 3
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The product of two rational numbers is always a rational number.
(pi) x (1/pi) = 1
sqrt(2) + sqrt(3) is irrational.
Not necessarily. The sum of two irrational numbers can be rational or irrational.
It can be, but need not be. [sqrt(5)+sqrt(2)] and [sqrt(5)-sqrt(2)] are both irrational. Their product is 5-2 = 3. The two numbers are conjugates of one another and the property that their product is an integer is used to rationalise denominator of surds.