What geometric shape best describes the perpendicular cross-section of a soup can?

The geometric shape that best describes the perpendicular cross-section of a soup can is a rectangle

Step-by-step explanation:

The parameters given are;

To find the geometric shape of a perpendicularly cross-sectioned soup can

The shape of soup can is a cylinder

The perpendicular (to the base) cross-section of a cylinder has the shape of a rectangle

Therefore, when a soup can is cross-sectioned perpendicularly to the base the shape one will see when looking at the interior of the cross-section is a rectangular outline.