The intersection of a square and a regular hexagon can be

Line Segment

Step-by-step explanation:

In geometry, a line segment is known as a part of a line which is bounded by two individual end points, and contains a point on every part of the line between its endpoints. A closed line segment has both endpoints, while an open line segment doesn’t have endpoints. while a closed half segments has one end closed and the other opened.

it would open into a square depending on the type of envelope i’m not sure about the second part

probably .5

i can on others if necessary.