AQA GCSE Mathematics key terms

The meaningful digits in a number, counted from its first non-zero digit.

Shapes whose corresponding angles are equal and whose corresponding lengths are in the same ratio.

The relationship between figures that have the same shape; corresponding angles are equal and corresponding sides are in the same ratio.

Shapes whose corresponding angles are equal and whose corresponding lengths are all in the same ratio.

Interest calculated on the original principal only, so the same amount of interest is added in each equal time period.

A ratio obtained by dividing every part by the same common factor until the parts have no common factor greater than 1.

Rewriting an expression in an equivalent but usually shorter or more useful form.

A pair or set of equations that must be true for the same values of the variables.

The ratio of the side opposite an angle to the hypotenuse in a right-angled triangle.

A formula relating each side of any triangle to the sine of its opposite angle: $\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}$.

A small drawing that represents the mathematical information in a question; it need not be accurately scaled unless stated.

The distance along the curved surface of a right cone from the edge of its base to its vertex.

An ordered pair of values that satisfies both equations at the same time.

The set of all coordinate pairs that satisfy an inequality or a group of inequalities.

All values of the variable that make an inequality true.

A right-angled triangle whose angles and side ratios give standard exact trigonometric values, particularly the $45^\circ$–$45^\circ$–$90^\circ$ and $30^\circ$–$60^\circ$–$90^\circ$ triangles.

Distance travelled per unit of time.

A number that can be written as $n^2$, where $n$ is a positive integer.

A unit raised to the power two, such as cm² or m², used to measure area.

A way of writing a number as $A \times 10^n$, where $1 \le A < 10$ and $n$ is an integer.

A recognised unit used consistently to describe a measurement, such as metres for length or kilograms for mass.

A numerical value calculated from data, such as a proportion, mean, median or range.

A graph made from all coordinate pairs that satisfy a linear equation; it has a constant gradient.

An inequality using $<$ or $>$, in which the boundary value is not included.

A correlation in which the points lie close to the overall trend.

The variable that stands alone on one side of a formula.

A set whose every element is also in another specified set.