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A Glossary of Mathematical Terms - Q

Q.E.D.

Quod erat demonstrandum: at the end of a proof.

Quadrangol

See Quadrilateral.

Quadrant

The plane is divided into four parts by the axes. They are called first, second, third and fourth quadrant.

Quadratic equation

ax2 + bx + c = 0.

Quadratic term of an equation

The second degree term of an equation.

Quadrilateral

A four-sided polygon: Trapezium, Rhomboid, Rhombus, Trapezoid, Rectangle, Square, Parallelogram.

Quartile

Any one of the values in a frequency distribution that divides the distribution in four parts of equal frequency.

Quotient

See Division.

first published on september 01 2003 - last updated on september 01 2003