Eduqas GCSE Mathematics key terms

A value of the unknown that makes an equation true when substituted into it.

All the values, or coordinate pairs, that make a mathematical statement true.

A line segment passing through the interior of a solid and joining two vertices that do not share a face.

A quadrilateral with four equal sides and four right angles.

A factor that is a perfect square. For example, $9$ is a square factor of $18$.

A number obtained by multiplying an integer by itself, such as $5^2=25$.

A number that gives a specified value when squared. For a positive value, the symbol $\sqrt{\phantom{x}}$ denotes its positive square root.

Side–Side–Side: two triangles are congruent if all three pairs of corresponding sides are equal.

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

An agreed amount used as a reference when measuring a quantity, such as a metre for length or a kilogram for mass.

The value supplied at the beginning of an iterative process, before the rule has been applied.

A point on a smooth curve where the tangent is horizontal. The turning point of a quadratic is a stationary point.

A numerical summary of data, such as a mean, median or range.

A graph forming a straight line, representing all coordinate pairs that satisfy its equation.

An inequality using $<$ or $>$, so equality is not allowed.

The variable isolated on one side of a formula, expressed in terms of the other quantities.

A set whose elements all belong to another set.

Replacing a variable with a given value in an expression or formula.

An angle formed by lines joining the endpoints of an arc or chord to a specified point. For example, chord $AB$ subtends angle $ACB$ at $C$.

An angle which adds to another angle to make $180^\circ$.

An irrational root left in exact form, such as $\sqrt{2}$ or $\sqrt{3}$.

The total area of the exposed surfaces of a three-dimensional object, measured in square units.

Writing all possible outcomes in a logical order so that none are missed or counted twice.

A straight line that touches a circle at exactly one point, even when extended in both directions.

A part of an expression added to the other parts, with its sign included. The terms of $3x-5$ are $3x$ and $-5$.

A decimal whose digits end after a finite number of decimal places, such as $0.375$.

A rule describing how to obtain the next term of a sequence from the current term.

A triangular-based pyramid with four triangular faces.