The shape of the cross-section parallel to the base of the box is rectangle
<h3>How to determine the shape?</h3>
The dimensions of the box is given as:
7 ¾ inches by 12 ¼ inches by 3 ¼ inches
The dimensions are not equal.
This means that the box is a rectangular prism
The cross-section of a rectangular prism is a rectangle
Hence, the shape of the cross-section parallel to the base of the box is rectangle
Read more about cross-section at:
brainly.com/question/15541891
#SPJ1