Edexcel GCSE Mathematics key terms

A region of a circle bounded by a chord and an arc.

A list of numbers or other objects arranged in a particular order according to a rule.

A collection of distinct objects, numbers or outcomes, called its elements.

Notation that describes a collection of values inside curly brackets, usually with a condition after a colon.

An elevation obtained by looking directly at the object from a specified side.

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

Having the same shape, with corresponding angles equal and corresponding side lengths in the same ratio.

Figures that have the same shape: corresponding angles are equal and corresponding lengths are in a constant ratio.

Shapes with the same shape: corresponding angles are equal and corresponding lengths are in a constant ratio.

Interest calculated from the same original sum in every time period.

A sample in which every member of the population has an equal chance of being selected.

A ratio written with whole-number parts that have no common factor other than 1.

A set of equations involving the same variables that must all be true at the same time.

The trigonometric ratio equal to opposite divided by hypotenuse.

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

For a cone, the distance from the edge of the circular base to the apex along the curved surface. For a pyramid, the face slant height is the perpendicular height of a triangular face, running from the apex to the relevant base edge.

A pair of values, such as $(x,y)$, that satisfies both equations in a simultaneous pair.

A value of the variable that makes an equation true. A solution of a quadratic equation is also called a root.

All values of the variable that make an inequality true.

A diagonal joining opposite vertices of a three-dimensional solid through its interior.

The distance travelled per unit of time.

A perfectly round solid whose surface is the same distance from its centre in every direction.

The result of multiplying a number or quantity by itself, such as $7^2=49$.

A number of the form $n^2$, found by multiplying an integer by itself.

The non-negative number which, when squared, produces a given non-negative number; for example, $\sqrt{49}=7$.

Information consisting of all three side lengths.

A way of writing very large or very small numbers as $a\times10^n$, where $1\leq a<10$ and $n$ is an integer.