Edexcel GCSE Mathematics key terms

The point of contact is the point where a tangent touches a circle.

A point that lies on both graphs and therefore represents values satisfying both equations.

A closed, flat shape made from straight line segments.

The complete set of people or items being studied.

The place a term occupies in a sequence, counted from 1; usually represented by $n$.

A rule that calculates a term directly from its position $n$, also called an nth-term formula.

A relationship in which larger values of one variable tend to be paired with larger values of the other.

A number greater than zero, written with or without a $+$ sign.

A systematic list or diagram showing all possible outcomes of an experiment; for two experiments it is often drawn as a two-way table.

An expression consisting of a base and an index, such as $x^4$.

The force acting per unit area.

Writing an integer greater than 1 as a product of prime numbers.

An integer greater than 1 with exactly two positive factors: 1 and itself.

The original amount borrowed or invested, before any interest is added.

The non-negative square root represented by the symbol $\sqrt{\phantom{x}}$; for example, the principal square root of $81$ is $9$.

The agreed sequence in which operations in an expression are carried out.

A three-dimensional solid with the same cross-section throughout its length.

A number from 0 to 1 that measures how likely an event is to occur.

The complete set of probabilities assigned to all possible outcomes.

A branching representation that shows the possible outcomes of successive events and the probability on each branch.

The result of multiplying numbers or expressions together.

A counting principle stating that if one task can be completed in $m$ ways and, for each of these, a second task can be completed in $n$ ways, the two tasks can be completed in $m \times n$ ways.

The right-angled shadow of a line on a plane, formed by dropping a perpendicular from the line's raised endpoint to the plane.

A logical argument that establishes a statement for every case covered by its conditions, using known facts and justified steps.

A fraction whose numerator is smaller than its denominator, so its value is less than $1$.

A comparison found by dividing one quantity by another; it can be written as a fraction, decimal or percentage.

A solid whose base is a polygon and whose triangular side faces meet at one apex.