Pi is the ratio of the circumference of a circle to its diameter.
It is approximately 3.14159, though usually it is alright to approximate it to 22/7 or 3.14
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That's the number pi, and yes, it is irrational.
the formula for pi is the ratio of the circumference of a circle to the diameter of the circle
The ratio of the circumference of a circle to its diameter is a constant, irrespective of the actual measurements. This ratio is called pi and is 3.1415...
The ratio of the circumference of a circle to its diameter is Pi. (3.14159)
the value of pi can be derived as the ratio between the circumference and diameter of every circle, say pi = circumference/diameter