Irrational numbers are numbers that cannot be expressed as the ratio of two whole numbers. This is opposed to rational numbers, like 2, 7, one-fifth and -13/9, which can be, and are, expressed as ...

If a number is a ratio of two integers (e.g., 1 over 10, -5 over 23, 1,543 over 10, etc.) then it is a rational number. Irrational numbers, when written as a decimal, they continue indefinitely ...

Real numbers are, in fact, pretty much any number that you can think of. This can include whole numbers or integers, fractions, rational numbers and irrational numbers.

Such a triangle has a fixed aspect ratio a ⁄ c. If both a and c are rational numbers, the lengths of the sides of the triangle can be chosen so that a and c each correspond to the smallest ...