Transcript Slide 1

Do Now 3/19/12
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Copy HW in your planner.
Text p. 324, #1-23 all, 28, 29
 Quiz sections 8.1-8.3 Wednesday
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Be ready to copy POTW #7
Objective
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SWBAT identify parallel, perpendicular,
and skew lines, and angles formed by a
transversal
Section 8.3 “Line and Angle
Relationships”
Intersecting Lines
The point where two lines cross
or intersect (intersection).
N
R
S
T
M
RT intersects line MN at point
S
Parallel Lines
Two lines that are in the same plane
and do not intersect.
T
N
R
M
RT || MN
is parallel to
Perpendicular Lines
Two lines that intersect and the angles that
are formed measure 90°.
R
N
RT  MN
M
T
is perpendicular to
Skew Lines
lines that do not intersect and they are not
parallel. They lie in different planes.
R
N
M
T
RT & MN are skew
Tell whether the lines appear parallel,
perpendicular, or skew.
WX and ZY
WX and UV
WX || ZY
WX and UV
are skew.
The lines are in
the same plane
and do not
intersect.
The lines are in
different planes
and do not
intersect.
WX and XU
WX  XU
The lines appear
to intersect to
form right
angles.
Adjacent Angles
Two angles that share a side and
vertex but DO NOT overlap
3
4
1
2
Vertical Angles
Opposite congruent angles
formed by two intersecting
lines.
1
2
3
4
Identify the adjacent angles and the vertical
angles in the diagram below.
1
3
2
4
Adjacent angles:
1&2
1&3
2&4
3&4
Vertical angles:
1&4
2&3
Transversal
a line that intersects two lines.
A
T
N
R
M
B
RT || MN
Angle Relationships
Angles that are
inside of the
parallel lines
Angles that are
outside of the
parallel lines
Angles that are
in matching
places
Line e
line d. Identify the corresponding,
alternate interior, and alternate exterior angles.
Corresponding
1 & 5; 2 & 6;
3 & 7; 4 & 8
d
e
5
Alternate Interior
2 & 7; 4 & 5;
7
Alternate Exterior
1 & 8; 3 & 6;
1
3
2
4
y
6
8
Line n line p. Find the measure of the missing
angles.
Angles 2, 4, and 6 are 130°.
Angles 1, 3, and 5 are 50°.
Line x
angles.
line y. Find the measure of the missing
Angles 2, 5, and 6 are 70°.
Angles 1, 3, 4,and 7 are 110°.
NJASK7 Prep
Homework
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Text p. 324, #1-23 all, 28, 29