# Study the word list: Key Stage 3: Mathematics: par - ref

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 parallel A trapezoid or trapezium is a type of quadrilateral with at least one pair of parallel sides. parallelogram A parallelogram is a four-sided shape with opposite sides equal and parallel. * negative Negative numbers are number less than zero. * numerator A fraction has a numerator and a denominator. * percentage I worked out the percentage of people with purple jumpers. * perimeter Add all the sides of a shape to get the perimeter. * perpendicular Perpendicular is exactly upright, at right angles to the base. * positive Positive numbers are numbers more than zero. * quadrilateral A trapezoid or trapezium is a type of quadrilateral with at least one pair of parallel sides. questionnaire Please complete the questionnaire. * radius The radius is a line from one side of a circle to the centre. * ratio Ratio data has an absolute zero. * recurring A recurring number is a number that goes on forever; for example, a third of ten is 3 point 33 recurring. * reflect In the exam, you will be asked to reflect a shape across an axis. reflection In mathematics, a reflection is a type of transformation.

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