2007-04-29 14:55:26 · 6 answers · asked by shanabanana922 2 in Science & Mathematics ➔ Mathematics
Pi is the ratio of the circumference of a circle to the diameter of the circle. pi is an irrational number, and its decimal expansion never terminates or becomes repeating. As a result, the diamter and circumference of a circle cannot both be rational. If the diameter is rational, the circumference must be irrational, and vice versa.
2007-04-29 15:01:55 · answer #1 · answered by DavidK93 7 · 0⤊ 0⤋
One way that people have defined the numbre Pi is as the ratio between the circumfrence of a circle and its diametre. If you take a circle...any circle you wish, and carefully measure the circumfrence (the length of the line that makes the circle) as well as the diametre ( a line that goes through the centre of the circle and, in a manner of speaking, cuts the circle in half) and divide these two numbrs the result will be an approximation to Pi. I say approximation because your measurments will have varying accuracy.
This is what is meant that Pi is a ratio. However, this does not mean that Pi can be represented as a fraction. This is because Pi is irrational...which means that it cannot be expressed as the ratio of two integers. This may seem like a contradiction...a numbre that is defined as a ratio being irRATIOnal but it isnt really. This is beause you can never measure the circumfrence and diameter exactly....you can get more and more accurate, but never exact. As your measurements get finer and finer the ratio between the circumfrence and diametre will get closer and closer to the value of Pi, but never exactly Pi.
2007-04-29 22:07:12 · answer #2 · answered by dave c 2 · 0⤊ 0⤋
It means that you did not find out that pi CAN NOT be a ratio. This is one of the non rational or IRRATIONAL numbers, which are NEVER expressable as a ratio. However, you can find ratios that are really close to the value of pi. The best I've found so far is 355 / 113 , which is accurate to the 6th decimal place, 3.1415929 versus 3.1415927
2007-04-29 22:06:17 · answer #3 · answered by Don E Knows 6 · 0⤊ 0⤋
Pi is the relation between the circumference and the diameter of a circle. Multiply the diameter of any circle with pi [3.14 or 22/7] and you will get the circumference..
2007-04-29 22:09:42 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Pi is the ratio of the circumference of a circle to its diameter and so dimensionlessor without units, whatever th units of the length of the cicumference and the diameter.
2007-04-29 22:01:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋
i lik pi
2007-04-29 22:03:29 · answer #6 · answered by adan s 2 · 0⤊ 1⤋