Cross section (geometry) facts for kids
A cross section is what one gets if one cuts an object into slices.
In geometry the correct definition of cross section is: the intersection of a body in 2dimensional space with a line, or of a body in 3dimensional space with a plane.
A cross section, or section is also an orthographic projection of a 3dimensional object from the position of a plane through the object. A floor plan is a section viewed from the top.
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Images for kids

Pinus taeda cross section showing annual rings, Cheraw, South Carolina
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Cross section (geometry) Facts for Kids. Kiddle Encyclopedia.