AQA GCSE Mathematics Key Terms

A continuous timekeeping system running from 00:00 to 23:59 that does not use AM or PM notation.

The three-dimensional geometric setting (involving length, width, and depth) in which shapes like cuboids exist, requiring extended formulas or 2D extraction to solve for diagonals and angles.

The application of 2D trigonometric rules (like SOH CAH TOA or Pythagoras) to extract and solve planes and angles within 3D figures.

An acute angle that represents one-sixth of a full rotation, formed internally by an equilateral triangle.

A technical term for the x-coordinate representing horizontal distance.

The rate of change of velocity, calculated from the gradient of a velocity-time graph.

A precise geometrical construction requiring a ruler, protractor, and/or compass to exact measurements.

An angle that is greater than $0^\circ$ and less than $90^\circ$.

The principle that the probability of either of two mutually exclusive events occurring is found by adding their individual probabilities.

The principle that the inequality sign is never reversed when merely adding or subtracting negative numbers.

The number that, when added to a given number a, yields zero; the additive inverse of a is -a.

The specific sequence of adding ratio parts together to determine the total number of shares.

A property of a sequence where each term is generated by adding preceding terms together.

In trigonometry, the side of a right-angled triangle next to the chosen angle theta that is not the hypotenuse.

Two angles that have a common vertex and a common side (arm) but do not overlap.

In trigonometry, the side of a right-angled triangle located next to the reference angle, which is not the hypotenuse.

The constant value added to the $dn$ part of a linear formula to align it with the sequence, equivalent to the value when $n = 0$.

A mathematical statement indicating that two expressions are equal, used here to formalize the relationship between proportional variables using k.

The state where two algebraic expressions represent the exact same mathematical value, even if written differently.

A collection of terms combining constants and variables using mathematical operations, but with no equals sign.

A fraction that contains variables (letters) in the numerator, the denominator, or both.

A logical sequence of algebraic steps used to show a mathematical statement is true for all possible cases.

A ratio where one or more parts are expressed using variables, such as $2x : 3x+1$.

An alternative, fully accepted exam term for co-interior angles.

Equal angles formed on opposite sides of a transversal crossing parallel lines.

A specific scenario in the Sine Rule (knowing two sides and a non-included angle) where the given information could describe two different valid triangles.

The maximum displacement of a wave from its central horizontal axis; for $y = \sin x$, the amplitude is 1.

A line that divides an angle into two equal parts. Every point on this line is equidistant from the two lines forming the angle.

The angle measured downwards from a horizontal line of sight to an object.

The angle measured upwards from a horizontal line of sight to an object.