In mathematics, a polynomial equation of second degree (that is, an equation containing as its highest power the square of a variable, such as x 2 ).
A plane figure formed by four intersecting lines. A simple quadrilateral is a polygon with four sides. A complete quadrilateral ( see diagram) is the
(QED), quantum field theory that describes the properties of electromagnetic radiation and its interaction with electrically charged matter in the
In statistics, any one of the three values that divide data into four equal parts. They comprise the lower quartile , below which lies the lowest 25%