Page 200 - Mathematics Coursebook

Glossary

ratio an amount compared to another secondary data data not collected by the
amount, using the symbol : 137 individual currently using the data 64

rectangle quadrilateral with two pairs of sector part of a circle, cut from the
equal and parallel sides, all angles 90° 87 circumference to the centre 185
recurring repeating; in a recurring fraction, sequence a set of numbers arranged
a digit or group of digits is repeated for ever 78 in order, according to a rule 20
re"ect transform a shape, resulting in the set square typically plastic, a triangular
mirror image of that shape 161 shape, with angles 90°,60° and 30° or 90°,
re"ection the mirror image of a shape 161 45° and 45° 121
re"ex angle an angle that is bigger than share to split up into parts 138
180 degrees 54 short division similar in method to long
remainder the number that is le% a%er a division; division but where remainders are simply
20 divided by 7 has a remainder of 6 12, 83 placed in front of the following digit 31
rhombus quadrilateral in which all sides side the one-dimensional lines
are equal, opposite sides are parallel, opposite bounding an object 87
angles are equal, but not 90° 87 sieve of Eratosthenes a method of "nding
right angle an angle of 90 degrees 54 prime numbers 14
right-angled triangle a triangle with a 90° simplest form dividing all parts of a
angle 87 fraction or ratio by their highest
rotate transform a shape, resulting in each common factor 73, 137
point of the shape moving around a "xed simplify (fraction) "nd an equivalent fraction
position by the same angle 161 with smaller numbers 73

rotation turning a shape around a "xed simplify (an expression or equation)
position 161 gathering, by addition and subtraction,

rotational symmetry a shape that can be all like terms to give a single term 98
rotated a fraction of a whole turn and simplify (ratio) dividing all parts of the
looks the same 91 ratio by a common factor 137
round make an approximation of a number, solid shape shape having three dimensions 87
to a given accuracy 37 solution the value of any unknown letter(s)
ruler a device used for drawing straight lines in an equation 26, 101
and measuring distances 120 solve calculating the value of any unknown
SAS used in constructions, an abbreviation of letter(s) in an equation 101
Side Angle Side or the length of two sides and sphere a solid with all points on its surface the
the size of the angle between them, minimum same distance from its centre 87
information to construct a square quadrilateral with all sides equal,
triangle 122 all angles 90° 87
scale a number of marks along a line used square centimetre (cm ) unit of area; area
2
in making measurements; equal distances of a square of side 1 centimetre 170
usually represent equal amounts 50 square kilometre (km ) unit of area; area
2
scalene triangle triangle in which all sides of a square of side 1 kilometre 170
are di#erent in length and all angles square metre (m ) unit of area; area of a
2
are di#erent 87
square of side 1 metre 170

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