- In geometry a quadrilateral is a four-sided polygon, having four edges (sides) and four corners (vertices). The word is derived from the Latin words quadri, a variant of four, and latus, meaning “side”. It is also called a tetragon, derived from greek “tetra” meaning “four” and “gon” meaning “corner” or “angle”, in analogy to other polygons (e.g. pentagon). Since “gon” means “angle”, it is analogously called a quadrangle, or 4-angle. A quadrilateral with vertices A, B, C and D is sometimes denoted as ABCD.
- History - Lincoln County, WA (co.lincoln.wa.us)
In 1883, Lincoln County was created from a portion of Spokane County, and four days later it, in turn, lost territory in the creation of Douglas County. Since that time there have been no changes in the boundaries of Lincoln County.
