Vertices: A vertex (plural: vertices) is a point where two or more line segments meet.

Edges: For a polygon an edge is a line segment on the boundary joining one vertex to another.

Line of symmetry: The line in the centre and that cuts a shape exactly in half. 

Rotational symmetry: A shape has rotational symmetry when it still looks the same after some rotation (of less than one full turn).

Alternate angles: When two lines are crossed by another line (the Transversal), a pair of angles on the inner side of each of those two lines but on opposite sides of the transversal.

Corresponding angles: When two lines are crossed by another line (the Transversal) 

Parallel lines: Two lines that never meet. They are always the same distance apart with the same gradient 

Perpendicular lines: Two lines that meet at a right angle 

Scale Factor: A scale factor is when you enlarge a shape and each side is multiplied by the same number. This number is called the scale factor.  

Bearings: The angle in degrees measured clockwise from North

Line segment: The part of a line that connects two points.

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