147. The tractate "Ohalot" (Tents) contains a number of geometric questions. In this problem, if we call the side of the square $S$, and the circumference of the circle $C$, we have $4 S - C = S$, i.e., $C = 3 S$; since $S$ is equal to the diameter of the inscribed circle, then $2 \pi R = 6 R$, hence, $\pi = 3$.
147. In this treatise, it is stated that the perimeter of a square circumscribed around a circle is a quarter larger than the circumference of that circle. Determine the approximation of $\pi$ used in this case by the Jews.

## Problem from the treatise "Mena hot."

Talmud.