# What formulas contain both a rational number and an irrational number

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The best known irrational number is Pi, so, any formula with that in it it, like the formula for

circumference of a circle - Pi * D
area of a circle - Pi * R^2
volume of a sphere - 4/3 * Pi * R^3

Here D and R should be rational numbers, eg integers, to meet your definition.

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## Related Questions:

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No. In fact, there are many more irrational real numbers than there are rational real numbers.

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If a number can be expressed as a ratio of two whole numbers then it's rational.
Alternatively, if a number can be expressed in decimal with a finite number of digits or as a repeating decimal then it's rational.

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It's a rational number since it can be represented as a ratio of two whole number, in this case 233 and 100.

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All integers are rational numbers. The easiest way to see that is to write an integer as a fraction with 1 as a denominator; 4=4/1=8/2; 5=5/1.
Any number that can be written as a ratio of two integers numbers is by definition a rational number ( it is a ratio---rational).
Any decimal number with a periodic decimal part can be cast as a fraction, so it is rational.
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### 0.45,5/12,0,247, explain why each number is a rational number or an irrational number.

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### Define the ff. digits natural # whole # national # irrational # real #??

Sounds like a "school homework" question.

Natural - numbers like 1, 2, 3, 4, ...

Whole - numbers without fractional parts, e.g., '1/2' is not a whole number

National - some countries have superstitions, e.g., American high-rises have no 13th floor,
and some Asian cultures favour street-addresses that contain many '6' characters.

Real - numbers that have a fractional part, e.g., '123.456'.

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e.g., 1/4, 1/5, 1/8, 1/10, 0.123, 0.45, 0.6.

Irrational -- numbers that cannot be exactly expressed,
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no matter how many digits you use.

Jun 15, 2011 | Computers & Internet

### Example of rational and irrational set of numbers chart

You're looking for a website with examples of rational and irrational numbers? Here's an extensive one:
Or are you just asking for a few examples?
1. Rational: 5, 2/4, -34
2. Irrational: ?2, ?
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