Edexcel GCSE Mathematics key terms

The rate at which velocity changes with time.

The size of the place value to which a number has been rounded or truncated, such as $1$, $0.1$ or $100$.

The side next to the angle being considered that is not the hypotenuse.

A fraction whose numerator, denominator or both contain algebraic expressions.

Angles on opposite sides of a transversal, both between or both outside two parallel lines; they are equal.

The situation in which given side–side–angle information can produce two different valid triangles because $\sin\theta=\sin(180^\circ-\theta)$.

The greatest vertical distance between the centre line and a maximum or minimum of a repeating graph.

The amount of turn between two lines or rays that meet at a point, measured in degrees.

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

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

Two angles next to each other whose outer arms form a straight line; together they measure 180°.

The point at which the triangular faces of a pyramid, or the curved surface of a cone, meet.

A value read from a graph that is close to the exact value but may be limited by the graph's scale and drawing accuracy.

Replacing a number with a nearby, easier number to make a calculation simpler.

A part of a circle's circumference between two points.

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

The multiplier relating the areas of similar figures; it is the square of the linear scale factor.

The region between a graph and the horizontal axis over a stated interval; its meaning and units depend on the quantities plotted.

A sequence in which the difference between each term and the next is constant.

Arranging values from smallest to largest.

A line that a curve approaches; the tangent graph has vertical asymptotes at angles where the function is undefined.

The change in the vertical quantity divided by the change in the horizontal quantity over an interval.

The total distance travelled divided by the total time taken.

The bearing for the return direction between the same two points.

A chart in which separate rectangular bars show the frequencies of categories.

The fixed number being raised to a power in an exponential expression; $k$ is the base in $k^x$.

The area of the face chosen as the base of a cone or pyramid, often represented by $B$.