3.14
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Pi=3.14 in basic math
infinity, the pi number keeps going on to infinity
Mathamatical pi is an irrational number. It classifys as an irrational number because the numbers never repeat and pi is a never ending number.
It is a number that comes up in math and is independent of the physical measurement. Some examples that are well know are e and pi. As the name implies, the numbers do not change---they are constant. Usually math constants are real and not imaginary numbers.
I would imagine that learning the numbers of Pi up to a certain point, like maybe 1000 numbers, would be the longest math lesson, in a sense. If you go through the basics of math may be you can't feel that any math lesson as longest math lesson in world.