The Pi number is one of the most famous numbers in maths, and is used in many formulas, always related to circumferences or circles. But what is the Pi number?
If you measure the perimeter of a circle, and divide it by its diameter, the value of this ratio is equal to approximately 3,14. This happens with the ratio of the length of the circumference of a circle and its diameter in all all circles. For this reason it is said that Pi is a constant, cause it exists direct proportionality between the ratio of the length of the circumference of a circle and its diameter.
P - perimeter of the circumference of the circle
d - diameter
Pi is an irrational number with a non-periodic infinite tithe, which is the ratio between the length of the circumference of a circle and its diameter. Next, we present the Pi number to its 300ª decimal place.
In daily maths, it is usually used the rounding to two decimal places :