Definition:Section (Geometry)
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Definition
Section of Line by Line
Let a geometrical line $A$ cross over (or intersect) another line $B$.
The point where they cross is called the section of the $B$ by $A$ (or equivalently, of $A$ by $B$).
Plane Section
Let $F$ be a $3$-dimensional figure.
A plane section of $F$ is the intersection of $F$ with a plane.