Edexcel GCSE Mathematics key terms

The trigonometric ratio equal to adjacent divided by hypotenuse.

A formula relating the three sides of a triangle to one angle, for example $a^2=b^2+c^2-2bc\cos A$.

A single example that shows a general claim is false.

A method for solving an equality of fractions: if $\frac{a}{b}=\frac{c}{d}$, then $ad=bc$.

The two-dimensional shape produced where a plane cuts through a three-dimensional solid.

A number of the form $n^3$, found by multiplying an integer by itself twice.

A function whose highest power of $x$ is $3$.

A running total of the frequencies up to a stated value or class boundary.

A graph showing cumulative frequency against the upper class boundaries of grouped data.

A quadrilateral whose four vertices lie on one circle.

A three-dimensional solid with a constant circular cross-section.

A change in which a quantity decreases over time or through repeated applications of a rule.

A number written using place value and a decimal point, such as $-2.75$ or $0.4$.

The number of digits written after the decimal point.

The mark separating the ones from the tenths in a decimal number.

The bottom number of a fraction; it is the quantity against which the comparison is made.

The mass per unit volume of a substance or object.

Events for which the occurrence of one changes the probability of a later event.

A compound decrease in the value of an asset over time.

Arranging values from largest to smallest.

A line segment joining two non-adjacent vertices of a two-dimensional shape or a solid.

A line segment through the centre of a circle with both endpoints on the circumference; it is twice the radius.

A pattern of the form $A^2-B^2$, which factorises as $(A+B)(A-B)$.

A relationship of the form $y=kx$, where the ratio $y/x$ is constant.

Discrete data can take only particular separate values, such as a number of goals.

The expression $b^2-4ac$ in the quadratic formula. Its sign determines the number of real roots.

A distribution shows how the values of a variable are spread across a data set and how often different values occur.