Which statement is true about the relationship between the diameter and circumference of a circle?

The unit rate between the circumference of a a circle and its diameter is pi.

The constant of proportionality between circumference of a circle and its diameter is 2.

The relationship between the diameter and circumference of a circle is not proportional.

The circumference of a circle is 3 times the diameter.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?