For reference, violent crime includes assault, murder, robbery, and rape, while property crime includes burglary, larceny, and vehicular theft. California proved to be the safest state in the nation, taking 11 of the top 25 cities. A suburb of one of the country's most dangerous cities landed in the No. 1 spot. Read on for the 25 safest cities in America: Virginia Beach, on the Atlantic Ocean at the mouth of the Chesapeake Bay, offers residents and visitors many outdoor and water activities.Visit Virginia Beach/Facebook. Population: 445,623.
In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on.
In Euclidean plane geometry, a quadrilateral is a polygon with four edges (or sides) and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on. An equivalent condition is that opposite sides are parallel (a square is a parallelogram), that the diagonals perpendicularly bisect each other, and are of equal length. 2  A quadrilateral is a square if and only if it is both a rhombus and a rectangle (four equal sides and four equal angles).