Q

Q

QED : Abbreviation for quod erat demonstrandum, used to denote the end of a proof.

Quadrangle : A closed broken figure  in the plane consisting of 4 line segments.

Quadrangular prism : A prism whose base is a quadrilateral.

Quadrangular pyramid : A pyramid whose base is a quadrilateral.

Quadrant : Any one of the four portions of the plane into which the plane is divided by the coordinate axes.                    

                                    2^nd Quad        1^st Quad

                                    3^rd Quad        4^th Quad

Quadratfrie : square free

Quadrantal angles : Any of the angles nπ /2 ( n = 0,1,2,3,4,………)

Quadratic equation   : An equation of the form f(x)=0 where f(x) is a second degree polynomial. That is,  ax²+bx+c=0.

Quadratic Expression : A function of the form f(x) = ax²+bx+c, where a ≠ 0.

Quadratic Function :  a function f(x) whose value at any value of x is given by the polynomial f(x) = ax²+bx+c. the graph of a Quadratic Function is Parabola.

Quadratic inequality : An inequality in which one side is a quadratic polynomial and the other side is zero. E.g. ax²+bx+c > 0

Quadrature : 1. The quadrature of a geometric figure is the determination of its area.               2. Quadrature means solving an integral analytically or numerically.

Quadric curve : The graph of a second degree equation in two variables.

Quadric surface : The graph of a second degree equation in three variables.

Quadrilateral : A geometric figure with four sides.

Quadrinomial : An algebraic expression consisting of 4 terms.

Quarter : indicates : one fourth = ¼ , One of the phases of moon,  one fourth of a year.

Quartic : it means fourth order. A quartic number is a number which equates the fourth power of an integer. A quartic function equated to zero results in quartic equation, that is ,                    ax⁴ + bx³ + cx² + dx + e = 0 ( a ≠ 0)

Quartic polynomial : A polynomial of degree 4.

Quartic Symmetry : Symmetry in a plane figure having four axes of symmetry.

Quartile : The first quartile of a sequence of numbers is the number such that one quarter of the numbers in the sequence are less than this number.

Quintic polynomial : A polynomial of degree 5.

Quinary : Quinary is a numeral system with five as the base. In this system, five numerals from 0 to 4, are used .

Quintal : A unit for weighing mass equals to 100 kg.

Quintic Equation : An algebraic equation of 5^th degree of the form ,                                          ax⁵ + bx⁴ + cx³ + dx² + ex + f = 0 ( a ≠ 0)

Quintic function : A fifth order expression of the form (ax⁵ + bx⁴ + cx³ + dx² + ex +f )(a≠0)

Quotient field : The set of rational numbers is afield and as any rational number is in the form a/b, where ‘a’ and ‘b’ are integers and b ≠ 0, the field of rational numbers is called quotient field.

Quotient : The number obtained by dividing one number into another.  In the division sentence:   88 div 11 = 8, the quotient is 8