AQA GCSE Mathematics key terms

Two angles whose sum is $180^\circ$; they have the same sine value.

A root that cannot be simplified to a rational number, such as $\sqrt2$ or $\sqrt3$.

The complete outside boundary of a 3D shape; it may contain flat and curved parts.

The total area of the exposed faces or curved surfaces of a three-dimensional solid.

Listing every permitted element or outcome in an organised way, without omissions or duplicates.

An ordered method for recording every possible outcome exactly once.

A straight line drawn to follow the direction of a curve at a particular point, used to estimate the curve’s gradient there.

One of ten equal parts of a whole; the first place to the right of the decimal point.

One item in a sequence; its position is usually numbered $1,2,3,\ldots$.

A decimal that has a finite number of digits after the decimal point, such as $0.375$.

The variable $n$ used to represent a term's position in a sequence, with $n=1$ for the first term, $n=2$ for the second term, and so on.

A rule that produces each new term from one or more preceding terms.

The result produced by a sequence rule at a particular position; it may be written as $T(n)$.

A coordinate pair substituted into an inequality to decide which side of its boundary contains the solutions.

A probability calculated from a model of the possible outcomes, rather than from results collected in an experiment.

One of one thousand equal parts of a whole; the third place to the right of the decimal point.

A direction given as an angle measured clockwise from north, written with three figures.

Data recorded in chronological order, usually at regular time intervals.

A change of a shape's position or orientation, such as a translation, reflection or rotation.

A transformation that moves every point by the same distance in the same direction, without turning, reflecting or resizing the shape.

A line that crosses two or more other lines at different points.

A quadrilateral with exactly one pair of parallel opposite sides.

A branching representation showing the possible sequences of outcomes and their probabilities.

The overall direction in which time series values generally move over time.

One repetition of a probability experiment, such as one roll of a die.

A figure formed by three line segments joining three vertices.

A number of objects that can be arranged in a triangular pattern; the $n$th triangular number is $\frac{n(n+1)}{2}$.

A relationship between an acute angle and two side lengths in a right-angled triangle, such as sine, cosine or tangent.