Made up of 2 rays joined together at a common point called a vertex The angle is Circle The set of points on a plane at a certain distance or radius from a single point the center Lines that intersect at 90 ID: 750023
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Slide1
Geometry VocabularySlide2
Angle
Made up of 2 rays joined together at a common point called a vertex.
The angle is Slide3
Circle
The set of points on a plane at a certain distance, or radius, from a single point, the centerSlide4
Lines that intersect at 90
angles.
PERPENDICULAR
LINES
M
E
Slide5
Perpendicular Lines
Two lines that intersect at a right angle (90°).
Written as
.Slide6
Lines in the same plane that do not intersect.
PARALLEL
LINES
W
E
G
O
Slide7
Parallel
Lines
Lines in a plane that
do
not share any points and never
intersect.Written as Slide8
Line Segment
A line with two endpoints.
Written as Slide9
Point
Point A or Point B
An exact position or location in a given plane.
Is represented by a dot and named with a capital letter.Slide10
Line
The set of points between points in a plane and the infinite number of points that continue beyond the points.
Written as
P
QSlide11
Ray
A line that has one endpoint and continues on forever in the opposite direction.
A
C
B
ESlide12
Right Angle
An angle that measures 90°.Slide13
Acute Angle
An angle measuring less than 90° but greater than 0°.Slide14
Obtuse Angle
An angle measuring greater than 90° but less than 180°.Slide15
Straight Angle
An angle measuring exactly 180°.Slide16
A triangle with no congruent sides.
SCALENE
TRIANGLESlide17
A triangle with two congruent sides.
ISOSCELES
TRIANGLESlide18
Points that lie in the same plane.
COPLANARSlide19
Points that lie on the same line.
COLLINEAR
A
R
M
A, R, & M are collinear pointsSlide20
Congruent
Figures are congruent if they have the same shape, size, lines, and angles.Slide21
Angles that have the same measure
CONGRUENT
ANGLES
B
E
B
Slide22
Two segments that have the same length.
CONGRUENT
SEGMENTS
O
K
Y
A
Slide23
Have the same shape but not necessarily the same size.
SIMILAR
3
4
5
6
8
10Slide24
Complementary Angles
Two angles that add up to 90 degrees.
1
2Slide25
Supplementary Angles
Two angles that add up to 180°.
1
2Slide26
Adjacent Angles
Two angles that share a common vertex and side.
SIDE BY SIDESlide27
Two angles in the same plane with a common vertex and a common side, but no common interior points.
ADJACENT
ANGLES
1
2
1 & 2
are adjacent angles Slide28
To divide into two congruent parts.
BISECT
L
K
M
bisects
LJM
JSlide29
The point that divides a segment into two congruent segments.
MIDPOINT
O
B
C
O is the midpoint of
Slide30
A closed plane figure formed by three or more segments such that each segment intersects exactly two other segments only at their endpoints and no two segments with a common endpoint are collinear.
POLYGONSlide31
A polygon that is both equilateral and equiangular.
REGULAR
POLYGONSlide32
Equilateral
Having all sides the same lengthSlide33
Altitude
a line that extends from one vertex of a
figure perpendicular to the opposite side, this is the height of figure. Slide34
Line of Symmetry
the imaginary line where you could fold the image and have both halves match exactlySlide35
Perpendicular Bisector
A line which cuts a line segment into two equal parts at a 90° angleSlide36
A
B
C
Interior Angle = Inside Angle
Exterior Angle= Outside AngleSlide37
A corner or point where lines, rays, polygons, or other geometric figures meet.
VERTEX
vertexSlide38
Vertical Angles
Two angles directly across from each
other that are
congruent
. They share a common vertex. E & G and H & F are vertical angles.
h
f
e
gSlide39
Linear Pair
A linear pair is a pair of adjacent angles that are supplementary. For example, angle 1 and 2 in the figure below form a linear pair.