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Vocabulary Flash Cards
acute angle
Chapter 1 (p. 39)
angle
Chapter 1 (p. 42)
between
axiom
Chapter 1 (p. 12)
collinear points
Chapter 1 (p. 4)
All rights reserved.
Chapter 1 (p. 48)
angle bisector
Chapter 1 (p .38)
Copyright © Big Ideas Learning, LLC
adjacent angles
Chapter 1 (p. 14)
complementary angles
Chapter 1 (p. 48)
Big Ideas Math Geometry
Vocabulary Flash Cards
Two angles that share a common vertex and side,
but have no common interior points

An angle that has a measure greater than 0 and

less than 90
common side
5
A
6
common vertex
5 and 6 are adjacent angles.
A ray that divides an angle into two angles that are
congruent
A set of points consisting of two different rays that
have the same endpoint
X
C
A, BAC , CAB,
or 1
W
Y
vertex
sides
1
A
Z

YW bisects XYZ , so XYW  ZYW .
When three points are collinear, one point is
between the other two.
B
A rule that is accepted without proof
The Segment Addition Postulate states that if B is
between A and C, then AB  BC  AC.
A
B
C
Point B is between points A and C.

Two angles whose measures have a sum of 90
B
C
A
58°
32°
Points that lie on the same line
A
B
C
A, B, and C are collinear.
D
BAC and CAB are complementary angles.
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Big Ideas Math Geometry
Vocabulary Flash Cards
congruent angles
Chapter 1 (p. 40)
construction
Chapter 1 (p. 13)
coplanar points
Chapter 1 (p. 4)
distance
Chapter 1 (p. 12)
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All rights reserved.
congruent segments
Chapter 1 (p. 13)
coordinate
Chapter 1 (p. 12)
defined terms
Chapter 1 (p. 5)
endpoints
Chapter 1 (p. 5)
Big Ideas Math Geometry
Vocabulary Flash Cards
Two angles that have the same measure
Line segments that have the same length
5 in.
A
5 in.
B
C
D
A
30°
30°
B
AB  CD
A  B
A real number that corresponds to a point on a line
A
B
x1
x2
coordinates of points
Terms that can be described using known words,
such as point or line
A geometric drawing that uses a limited set of
tools, usually a compass and a straightedge
A
B
C
D
Points that lie in the same plane
A
Line segment and ray are two defined terms.
M
C
B
A, B, and C are coplanar.
Points that represent the ends of a line segment or
ray
endpoint
endpoint
A
A
B
x1
A
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AB
B
x2
AB = x2 − x1
endpoint
All rights reserved.
The absolute value of the difference of two
coordinates on a line
B
Big Ideas Math Geometry
Vocabulary Flash Cards
exterior of an angle
interior of an angle
Chapter 1 (p. 38)
Chapter 1 (p. 38)
intersection
line
Chapter 1 (p. 4)
Chapter 1 (p. 6)
line segment
Chapter 1 (p. 5)
measure of an angle
Chapter 1 (p. 39)
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All rights reserved.
linear pair
Chapter 1 (p. 50)
midpoint
Chapter 1 (p. 20)
Big Ideas Math Geometry
Vocabulary Flash Cards
The region that contains all the points between the
sides of an angle
The region that contains all the points outside of an
angle
exterior
interior
A line has one dimension. It is represented by a
line with two arrowheads, but it extends without
end.
The set of points two or more geometric figures
have in common
m
A
A
B
n
line , line AB (AB),
or line BA (BA)
The intersection of two
different lines is a point.
Two adjacent angles whose noncommon sides are
opposite rays
Consists of two endpoints and all the points
between them
common side
endpoint
endpoint
A
B
1 2
noncommon side noncommon side
1 and 2 are a linear pair.
The point that divides a segment into two
congruent segments
M
B
AB.
So, AM  MB and AM  MB.
0 10
180 170 1 20
60
M is the midpoint of
A
O
B
170 180
60
0 1 20 10 0
15
0 30
14 0
4
80 90 10 0
70 10 0 90 80 110 1
70
2
60 0 110
60 0 13
2
50 0 1
50 0
3
1
3
15 0 4
01 0
40
A
The absolute value of the difference between the
real numbers matched with the two rays that form
the angle on a protractor
mAOB  140
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Big Ideas Math Geometry
Vocabulary Flash Cards
obtuse angle
opposite rays
Chapter 1 (p. 5)
Chapter 1 (p. 39)
plane
point
Chapter 1 (p. 4)
Chapter 1 (p. 4)
postulate
ray
Chapter 1 (p. 5)
Chapter 1 (p. 12)
right angle
Chapter 1 (p. 39)
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segment
Chapter 1 (p. 5)
Big Ideas Math Geometry
Vocabulary Flash Cards


If point C lies on AB between A and B, then CA

and CB are opposite rays.
A C

An angle that has a measure greater than 90 and

less than 180
B


CA and CB are opposite rays.
A location in space that is represented by a dot and
has no dimension
A
A
A flat surface made up of points that has two
dimensions and extends without end, and is
represented by a shape that looks like a floor or a
wall
point A
A
B
M
C
plane M, or plane ABC

AB is a ray
if it consists of the endpoint A and all
points on AB that lie on the same side of A as B.
A rule that is accepted without proof
The Segment Addition Postulate states that if B is
between A and C, then AB  BC  AC.
endpoint
A
B

AB
Consists of two endpoints and all the points
between them
endpoint
endpoint
A
B

An angle that has a measure of 90
A
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Big Ideas Math Geometry
Vocabulary Flash Cards
segment bisector
Chapter 1 (p. 20)
straight angle
Chapter 1 (p. 39)
undefined terms
Chapter 1 (p. 4)
sides of an angle
Chapter 1 (p. 38)
supplementary angles
Chapter 1 (p. 48)
vertex of an angle
Chapter 1 (p. 38)
vertical angles
Chapter 1 (p. 50)
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Big Ideas Math Geometry
Vocabulary Flash Cards
The rays of an angle
A point, ray, line, line segment, or plane that
intersects the segment at its midpoint
C
C
sides
M
A
B
D
A
B

CD is a segment bisector of AB.
So, AM  MB and AM  MB.

Two angles whose measures have a sum of 180
An angle that has a measure of 180
M

A
75° 105°
J
K
L
JKM and LKM are supplementary angles.
The common endpoint of the two rays that form an
angle
C
Words that do not have formal definitions, but
there is agreement about what they mean
In geometry, the words point, line, and plane are
undefined terms.
vertex
A
B
Two angles whose sides form two pairs of opposite
rays
3
4
5
6
3 and 6 are vertical angles.
4 and 5 are vertical angles.
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Big Ideas Math Geometry
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