Pi is an undefinable number, as it has an infinite number of places. It is roughly 3.141592653...
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The ratio is pi, a transcendental number, which is a subset of irrational numbers. pi is approximately equal to 3.14159
All numbers are unique and so there is no other number equal to pi. Pi is not a rational number so there is no fraction that is equal to pi. It has an infinitely long non-recurring decimal representation so there is no way to write a decimal eqiuvalent either.
Pi (π) is calculated as the ratio of a circle's circumference to its diameter. Therefore, the two numbers used to calculate pi are the circumference of the circle and its diameter. This relationship holds true for all circles, making pi a constant approximately equal to 3.14159.
there are infinite numbers in pi
it can't be expressed as a fraction. the numbers after the decimal go on and on without end. No fraction can be divided to equal pi, therefore, it's irrational.