definitions and symbols © 2008 mr. brewer. a flat surface that never ends
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Definitions and Symbols
© 2008 Mr. Brewer
A flat surface that A flat surface that never endsnever ends
An exact locationAn exact location
. ARead - point A Write
- A
A straight figure with A straight figure with two endpoints.two endpoints.
ABWrite
Read – line segment ab
a b
A straight figure with no A straight figure with no endpoints and goes on endpoints and goes on
forever in both directionsforever in both directions..
GH
Write -
Read – line GH
G H
A straight figure with one end A straight figure with one end point. It goes on forever in point. It goes on forever in
one directionone directionB A
BA
Write
Read – ray BA
An angle is formed by two An angle is formed by two rays with the same endpointrays with the same endpoint
QR
P Read – angle PQR or angle RQP or
angle QWrite -
PQRQ RQP
A common endpoint of A common endpoint of two rays or line two rays or line
segments.segments.
vertex
When the two sides of an When the two sides of an angle form a square corner. angle form a square corner.
The angle measures 90The angle measures 9000..
An angle that measures An angle that measures less than 90less than 9000..
Angle Angle measures measures less than less than
909000
An angle that measures An angle that measures more than 90more than 9000..
Angle Angle measures measures more than more than
909000
Lines that meet or Lines that meet or cross at a common cross at a common
pointpoint
AB and
Write -
CD intersect at point E
A D
C BE
Intersecting lines that Intersecting lines that form right angles.form right angles.
FIH
G
J
Read – line FG is perpendicular to line HI
HI
Write -
FG
Lines in the same Lines in the same plane that never crossplane that never cross
Read – line KL is parallel to line MN
M N
K L
KLWrite -
KL
A plane figure where all the points on the A plane figure where all the points on the circle are the same distance from the circle are the same distance from the center. A circle is named by its center center. A circle is named by its center
pointpoint
. A Circle A
A point in the center A point in the center of a circleof a circle..
Center
Any line segment with endpoints Any line segment with endpoints at the center of the circle and on at the center of the circle and on
the circle.the circle.
BCBC is a radiusof circle BB
CB
Any line segment that passes through the Any line segment that passes through the center of the circle and has both endpoints center of the circle and has both endpoints
on the circle. Twice the length of the radius.on the circle. Twice the length of the radius.
CDCD is a diameterof circle BBC
D
B
A path that begins and ends at A path that begins and ends at the same point and does not the same point and does not
cross itself cross itself
A closed figure formed from line segments that do not A closed figure formed from line segments that do not cross. Polygon means, “Many Angles.” Most polygons are cross. Polygon means, “Many Angles.” Most polygons are
named for the number of angles it has.named for the number of angles it has.Ex. Tri means 3… TriangleEx. Tri means 3… Triangle
““Must have 3 or more sides.”Must have 3 or more sides.”
A four sided polygonA four sided polygon
A quadrilateral with opposite A quadrilateral with opposite sides that are parallel and the sides that are parallel and the
same lengthsame length14
in.
14 in
.
8 in.
8 in.
AA quadrilateral with opposite sides quadrilateral with opposite sides that are parallel, the same that are parallel, the same
length, and have all right angleslength, and have all right angles
10 in
All Right Angles4
in
4 in
10 in
A quadrilateral with opposite sides that A quadrilateral with opposite sides that are parallel, all the sides are the same are parallel, all the sides are the same
length, and have all right angleslength, and have all right angles
All Right Angles
4 in
4 in
4 in
4 in
A parallelogram with A parallelogram with all four sides equalall four sides equal
22 in
22 in
22 in
22 in
A quadrilateral with exactly A quadrilateral with exactly one pair of parallel sidesone pair of parallel sides
Parallel
Sides
A polygon with three A polygon with three sidessides
A triangle with one A triangle with one right angle.right angle.
A triangle whose sides A triangle whose sides are all equal in lengthare all equal in length
8 mm
8 m
m
8 mm
None of the sides are None of the sides are equal in lengthequal in length
12 in
40 in
34 in
Two sides are equal Two sides are equal in lengthin length
20 cm
20 c
m
15 cm
Figures with exactly the same Figures with exactly the same shape. They may or may not be shape. They may or may not be
the same sizethe same size
Figures with exactly the Figures with exactly the same size and shape. same size and shape.
Movement of a figure Movement of a figure along a line. along a line.
A movement of a figure over a line so A movement of a figure over a line so that the figure faces in the opposite that the figure faces in the opposite
direction. The lines may be imaginarydirection. The lines may be imaginary..
The movement of a The movement of a figure around a point.figure around a point.
90 degree turn 180
degree turn
The movement of a The movement of a figure around a point.figure around a point.
270 degree turn 360
degree turn
A figure has a line of symmetry if it can be A figure has a line of symmetry if it can be folded so that its two parts match. The folded so that its two parts match. The
fold is called the line of symmetry. fold is called the line of symmetry.
A pair of numbers used to locate a point on a A pair of numbers used to locate a point on a grid. The first number tell you to move grid. The first number tell you to move
across the across the X – axisX – axis. The second number tells . The second number tells you to move up or down the you to move up or down the Y – axis.Y – axis.
3 , 2Says move 3 right
Move 2 up to your pointX
Y
The starting point or the The starting point or the
ordered pair (ordered pair (0 , 00 , 0))
X
Y origin
A figure that has one or A figure that has one or more lines of symmetry. more lines of symmetry.