Water is pumped into lake at a flow of 41 cubic feet per minute. The water travels through a pipe with a fixed diameter. If the average water velocity through the pipe is 300 feet per minute, what is the area of the pipe opening?

The construction shown in this image is B) A square inscribed in a circle.

This construction is made by taking four points in a circle that are equally distant from each other and drawing lines connecting these four points, resulting in a square. 

A square circumscribed about a circle would end up with the circle inside the square. The circumcenter and incenter of a square are not shown in this diagram.