AQA GCSE Mathematics key terms

A property or point that remains unchanged after a transformation or sequence of transformations.

A point that finishes in exactly the same position after a transformation or sequence of transformations.

A function that reverses another function, taking an output back to its original input.

An operation that reverses another operation, such as subtraction reversing addition.

Operations that undo one another, such as addition and subtraction or multiplication and division.

A relationship of the form $y=k/x$, where the product $xy$ is constant.

The operation used to find an angle from its sine value, written $\sin^{-1}$.

A calculator operation that finds an angle from its sine or cosine, such as $A=\cos^{-1}(0.6)$.

A triangle with at least two equal sides; the angles opposite those sides are equal.

The process of repeatedly using the output from one calculation as the input to the next.

An explanation of what each symbol, colour or style in a diagram denotes. In a pictogram, it also states the numerical value represented by one symbol.

A quadrilateral with two pairs of equal adjacent sides.

Rules used to rewrite and simplify powers while preserving their value.

The term $ax^2$ in $ax^2+bx+c$; its coefficient $a$ is called the leading coefficient.

The distance between two points, measured in units such as millimetres, centimetres, metres or kilometres.

The multiplier that changes every corresponding length from one similar figure to another.

Terms with the same surd part and the same variables raised to the same powers, so their coefficients can be collected.

Terms with exactly the same variable part, including the same letters raised to the same powers.

The smallest and greatest boundaries consistent with the stated accuracy of a rounded measurement.

A straight one-dimensional object that continues without end in both directions.

An equation in which the unknown has highest power 1.

A rule such as $y=mx+c$ whose graph is a straight line.

An inequality in which each variable has highest power 1 and variables are not multiplied together.

A sequence whose nth term can be written in the form $an+b$, where $a$ and $b$ are constants.

An estimated straight line that represents the overall trend of points on a scatter graph.

A line that divides a shape into two parts which are exact mirror images of each other.

The part of a straight line between two endpoints, such as $AB$.