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No number can be rational and irrational at the same time.
3.14 is the ratio of 314:100 and so is rational. HOWEVER, 3.14 is also a common approximation for pi, which is an irrational number.
All Irrational Numbers have infinite, non-recurring decimals and so are often approximated by rationals.
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Why isn't 3.14 an irrational number?
A rational number is a real number which can be expressed as a division of two integers. A real number which is not rational is called irrational. Since 3.14 = 314/100 and 314 & 100 are integers it is a rational number.
Is 3.14 irrational?
No. It can be written as a fraction where the denominator is not 0. For example, 314/100. This makes it rational.
What is the radius of a circle if its area is 314?
9.9975
What is the diameter of a circle whose circumference is 314?
The diameter of a circle whose circumference is 314 is about 1 (99.95).
What is 3.14 x 4?
Don't get cared by the decimal, it's just a point. It means: divide by 10^n where n is the number of digits after the decimal. So in this case, 3.14 means 314 / 10^2 = 314 / 100 so you are actually doing this 314/100 x 4 = 314 x 1/100 x 4. Multiplication is commutative so you might as well do 4 x 314, then divide by 100. So you should get 1256 / 100. To divide by 100, recall what decimal means, it's simply 12.56 :D
