integers
{... -2, -1, 0, 1, 2 ...}
whole
numbers { 0, 1, 2, 3 ...}
natural
numbers { 1, 2, 3 ...}
union
 A U B
intersection
 A ï B
venn
diagram of sets
cm
0.01 x 1 metre
hectare
unit of measurement for large areas like farms
frequency
type of table used in statistics
range
from the smallest to the largest
sohcahtoa
remembering word for sin, cos, tan
pythagoras
we study his formula for triangles
radius
a distance in a circle
equation
for example  y = 3x - 8
gst
a tax with a rate of 12« %
km
1000 metres
sum
adding things together
formula
for example  A = ãrý
expression
for example  4x + 3y - 8zý + 7
variables
letters like  x  used in Maths
quadrilateral
4-sided figure
pentagon
5-sided figure
hexagon
6-sided figure
cyclic
quadrilateral fitting into a circle
tangent
straight line just touching circle
exterior
angles on the outside
interior
angles on the inside
isosceles
triangle with 2 sides the same
factorise
example  3xý + 6x  =  3x(x + 2)
expand
example  2x(x + 5) =  2xý + 10x
area
what = «ab sinC
gradient
y-step divided by x-step
median
middle value of a set of numbers in order
mean
(statistics)  total ö how many
histogram
like a bar graph ; bars touch
inverse
operation going the other way
mode
(statistics) value with the greatest frequency
frequency
(statistics) how many times we get a value when measuring
undefined
result of ö zero
significant
figures,   0.0005039 has 4 of these
hectare
area which is 100m x 100m
perimeter
distance around the outside
multiples
the --------- of 5 are  5, 10, 15, 20, 25, 30, ...
parallelogram
has rotational symmetry of order 2 but no line symmetry
image
what you get when you reflect things
cos
adjacent side over hypotenuse
sin
opposite side over hypotenuse
tan
opposite side over adjacent side
scale
factor by which shapes are enlarged or reduced
reflection
transforms  Õ  into  ¸