Mark u there what is the number pi stand for

According to https://www.scientificamerican.com/article/what-is-pi-and-how-did-it-originate/

Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle's size, this ratio will always equal pi. In decimal form, the value of pi is approximately 3.14. Measure the circumference with a ruler.

Step-by-step explanation:

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