Why is the ratio of a circle’s circumference to its diameter important?

Question

Why did the first person even ask what it was?

In: 112

Answer 1

We had rules for a square, triangle rectangle etc to ge the area, they would have noticed the relationship between the square of the radius and the circumference, for smaller numbers it is roughly 3 times the quantity, they would have known that it is not exact though if they used something like a rope ruler to measure out a circle with a circumference of small length.