OCR GCSE Mathematics key terms

Money paid or received for borrowing or saving money.

The percentage of the principal charged or paid during a stated period.

An angle inside a polygon, formed by two adjacent sides at a vertex.

A line where two parts of a composite shape meet; it is not part of the perimeter if it lies inside the finished shape.

Estimating a value between two marked divisions on a graph scale.

The difference between the upper and lower quartiles: $\mathrm{IQR}=Q_3-Q_1$. It measures the spread of the middle 50% of the data.

The region common to two or more sets of points, in which all the stated conditions are satisfied.

The range between a lower bound and an upper bound within which a root is known to lie.

A method that repeatedly tests the midpoint of an interval and retains the half containing a sign change.

A point whose image occupies exactly the same position as the original point.

A feature or quantity that remains unchanged under a transformation.

The calculator function $\cos^{-1}$ used to find an angle from its cosine value.

A reverse rule that takes an output back to its original input.

An operation that reverses another operation, such as subtraction reversing addition.

A relationship in which the product of two quantities is constant: xy = k, or y = k/x.

The calculator operation sin⁻¹ that finds an angle from its sine value.

A function such as $\sin^{-1}$, $\cos^{-1}$ or $\tan^{-1}$ that finds an angle from a trigonometric ratio.

A drawing that represents a three-dimensional solid using vertical lines and two sets of equally spaced diagonal lines.

A transformation that preserves distances, so the image is congruent to the original. Translations, rotations and reflections are isometries.

A triangle with two equal sides; the angles opposite those sides are equal.

A numerical process in which repeated calculations produce increasingly accurate approximations.

A guide explaining what colours, symbols or patterns represent.

The study of motion using quantities such as velocity, acceleration, displacement and time.

A quadrilateral with two pairs of equal adjacent sides.

Text that identifies a variable, category or unit on a chart or graph.

The multiplier that changes each length of one similar shape into the corresponding length of another.

Terms with exactly the same variables raised to the same powers, such as $3x^2$ and $-7x^2$.