Year 9 Maths - End of Year Vocabulary

Density

Mass / Volume

Compound measure

Combine two or more different units/measures

Theoretical frequency

Number of times an outcome is expected to occur, found by P(A)#Trials

Sample space diagram

Two-way table used to show all possible outcomes, which can be used to find probabilities

Object

What you start with, before a transformation

Image

Result after transformation

Invariant points or lines

Points or lines that aren't affected by a transformation

Reflection

Flipping (a shape) over a line

Rotation

Turning (a shape) about a point

Direct proportion

As one quantity increases, the other increases by the same factor. The graph is a straight line that passes through the origin

Inverse proportion

As one quantity increases, the other decreases by the same factor

Reciprocal

The multiplicative inverse of a number

When dividing/multiplying by a negative

Flip inequality signs

What angles on a straight line sum to

180 degrees

What angles around a point sum to

360 degrees

What angles in a triangle sum to

180 degrees

What vertically opposite angles are

Equal

Formula for interior angle sum of a polygon

180(n - 2)

What co-interior angles sum to

180 degrees

Corresponding angles

Equal & lie on the same side of the transversal and in corresponding positions

Alternate angles

Equal & angles on opposite sides of a transversal

Asymptote

A line that a graph approaches but never touches

Types of congruency in triangles

ASA, SSS, SAS and RHS