Page 201 - MAT KS3 Y8 Cambridge CheckPoint

Glossary and index
proof an argument to show a particular
statement or fact is true 54
prove give a proof 54
questionnaire a set of written questions
with a choice of answers 62
radius (plural radii) a line segment from
the centre of a circle to its circumference (or
from the centre of a sphere to its surface);
the length of this line segment 120
random describes a situation where
outcomes are equally likely 150
range the difference between the largest
and smallest number in a set 103
ratio an amount compared to another
amount, using the symbol : 141
recurring repeating; in a recurring fraction,
a digit or group of digits is repeated forever
reduction decrease 113
reflect transform a shape, producing the
mirror image of that shape 158
right angle, hypotenuse, side (RHS)
condition that construction of a right-angled
triangle is possible, given the lengths of the
hypotenuse and one other side 126
rotate transform a shape, moving or
turning each point of the shape around
a fixed position through the same angle 158
rotational symmetry the property that
means that a shape can be rotated a fraction
of a whole turn and still look the same as it
does in its initial position 86
round make an approximation of a
number, to a given accuracy 36
sample a selection from a large population 62
scale the ratio between the lengths on a scale
drawing and the actual lengths represented 92
scale drawing an accurate drawing in
which lengths in the drawing are in a given
ratio to lengths in the original 92
scale factor the ratio by which a length is
increased (or decreased) 161
sector part of a circle, the edges of which
are two radii (plural of radius) and an arc 120
segment part of a circle, bounded by
an arc and a chord 120
simplify (a ratio or fraction) divide all
parts of the ratio (or fraction) by a common
factor 141
simplify (an expression or equation)
gathering, by addition and subtraction,
all like terms to express each term in its
simplest form 96
square the result of multiplying a
number by itself; the square of 5 is 25
because 5 squared = 5 = 5 × 5 = 25 15
2
square root the number that produces
a given number when squared; the square
root of 25 = 25 = 5 (or −5) 15
73
side, side, side (SSS) condition that
construction of a triangle is possible,
given the lengths of all three sides 126
statistics study and use of data; values
calculated from a set of data 103
stem-and-leaf diagram a way of
displaying data like a horizontal bar graph
but with a set of digits forming the bars 186
survey a method of collecting information
by asking questions or observing 62
term-to-term rule a rule to find a term
of a sequence, given the previous term 19
terminating ending; a terminating
decimal has a finite number of decimal
places, it does not go on forever 73
theoretical probability a probability
found using equally likely outcomes 154
transform move a shape by reflection,
rotation or translation; change a shape
by enlargement 158
translate transform a shape, moving
each part of the shape the same distance
in the same direction 158
transversal a line crossing parallel lines 51
199