Given a text, write a compressed version of it in a single sentence.

What is missing, for example, at square the circle, is the information that because the area of a circle is mathematically calculated using pi, which is irrational, there is no mathematical way of calculating the dimensions of a square with the same area as that of a given circle.
What is missing at square the circle, is the information that because the area of a circle uses pi, there is no way of calculating a square with the same area of a circle.