12-hour clock a system of measuring time in terms of a repeating period of 12 hours 24-hour clock

origin the point on a coordinate grid where the value of both variables is zero; it is
usually where the axes cross
outcome a possible result of an event; throwing a dice is an event, scoring a six is
an outcome
output the result after a number has been acted upon by a function
parallel straight lines where the shortest
(perpendicular) distance between is always the same; straight railway lines are parallel
parallelogram quadrilateral with two pairs of equal and parallel sides, opposite angles equal, but not 90°
per cent out of 100; the symbol for this is %
ratio an amount compared to another amount, using the symbol :
rectangle quadrilateral with two pairs of equal and parallel sides, all angles 90°
recurring repeating; in a recurring fraction, a digit or group of digits is repeated for ever
reflect transform a shape, resulting in the mirror image of that shape
reflection the mirror image of a shape
reflex angle an angle that is bigger than180 degrees
remainder the number that is left after a division;20 divided by 7 has a remainder of 6
rhombus quadrilateral in which all sides are equal, opposite sides are parallel, opposite
angles are equal, but not 90°
right angle an angle of 90 degrees
right-angled triangle a triangle with a 90°angle
rotate transform a shape, resulting in each point of the shape moving around a fixed
position by the same angle
rotation turning a shape around a fixed position
rotational symmetry a shape that can be rotated a fraction of a whole turn and looks the same
round make an approximation of a number,to a given accuracy
ruler a device used for drawing straight lines and measuring distances
scale a number of marks along a line used in making measurements; equal distances usually represent equal amounts