Eduqas GCSE Mathematics key terms

A combination of numbers, variables and operations, such as $3(x-8)$. An expression does not itself state that two quantities are equal.

A fraction containing an algebraic expression in its numerator or denominator, or both. Its denominator must not be zero.

A logical argument using algebra to establish that a statement is true in every case covered by the argument.

Angles between two lines, on opposite sides of a transversal. They are equal when the two lines are parallel.

The theorem that the angle between a tangent and a chord through the point of contact equals the angle subtended by that chord in the alternate segment of the circle.

Wording that has more than one reasonable interpretation, so different people may understand the question differently.

The maximum distance of a wave from its middle line. The graphs of $y=\sin x$ and $y=\cos x$ have middle line $y=0$ and amplitude $1$.

The amount of turn between two arms meeting at a point, usually measured in degrees.

The angle between a line and its perpendicular projection onto a plane.

A line or ray that divides an angle into two equal angles.

The highest point or pointed tip of a shape, such as the point where a pyramid's triangular faces meet.

A value close to an exact value, used in its place to simplify a calculation.

A portion of the circumference of a circle.

The amount of space inside a two-dimensional shape, measured in square units.

The multiplier taking an area to the corresponding area in a similar shape. It is $k^2$, where $k$ is the linear scale factor.

The size of the region between a graph and the horizontal axis over a specified interval.

A sequence in which the difference between consecutive terms is constant; also called an arithmetic sequence or linear sequence.

Angle–Side–Angle: two triangles are congruent if two pairs of corresponding angles and the sides between those angles are equal.

An arrangement of numbers from smallest to largest.

A condition taken to be true when using a mathematical model, such as all workers working at the same constant rate.

A line that a curve approaches increasingly closely. For $y=\frac1x$, both coordinate axes are asymptotes.

The total change in one quantity divided by the corresponding change in another over an interval; represented by the gradient of a chord.

The total distance travelled divided by the total time taken.

A diagram using separate bars whose heights represent the frequencies of categories.

The number or expression raised to a power. In $x^5$, the base is $x$.

A direction expressed as an angle measured clockwise from north at the starting point, written with three digits.

A systematic tendency for the way data is selected, collected or presented to favour some outcomes over others.