przekroju

Przekrój, or cross-section in Polish, refers to any surface or line cut by a plane. In geometry, a przekrój is the intersection of a solid with a plane, resulting in a two-dimensional shape whose properties (area, perimeter) depend on the plane's orientation and position. Common examples include the circular cross-section of a cylinder and the rectangular cross-section of a prism. Cross-sections are used in calculating volumes by slicing, via methods of Cavalieri or integral calculus, and in descriptive geometry to visualize objects.

In anatomy and medicine, przekrój is used to describe images produced by cross-sectional imaging techniques such as CT or MRI, which display a slice of the body. These images aid in visualizing internal structures and diagnosing conditions.

In geology and engineering, cross-sections help understand the internal structure of rocks, soils, or buildings by representing a vertical or horizontal slice of the subject. They are essential in field surveys, construction planning, and interpretation of subsurface features.

Przekrój is also the name of a Polish weekly magazine devoted to culture, arts, and social issues. Founded in the mid-20th century, it became one of the country’s best-known cultural periodicals, published in print for several decades before ceasing print publication in 2013 and continuing online under the same title.