22/7 or 3.142857...
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At around 1900 B.C., Egyptians estimated the value of pi to be 256/81.
An Egyptian scribe named Ahmes wrote the oldest known text to imply an approximate value for π. The Rhind Mathematical Papyrus dates from the Egyptian Second Intermediate Period - though Ahmes stated that he copied a Middle Kingdom papyrus (i. e., from before 1650 BCE). In problem 48 the area of a circle was computed by approximating the circle by an octagon. The value of π is never mentioned or computed, however. If the Egyptians knew of π, then the corresponding approximation was 256/81 or 3.16
The ancientsgave pia value of 3 which is wrong but even today we do not know its exact value only that it is the circumference of a circle divided by its diameter
It is the number whose square root you need to obtain.
P=19. Just add 13 & 6 to obtain value.