Transcript Slide 1
Do Now 4/4/13
Take out your HW from last night.
Text p. 320-321 “Hands-On Lab”
Copy HW in your planner.
Text p. 324, #1-23 all, 28, 29
Quiz sections 8.1-8.3 Monday
Get a ruler and a pack of crayons
from the ledge.
Homework
Text p. 320-321 “Hands-On Lab”
1) Angles 1, 4, 5, 8 = 55°
Angles 2, 3, 6, 7 = 125°
2) a. Angles 3, 4, 5, 6
b. Angles 1, 2, 7, 8
c. Angles 3 & 6 are equal.
Angles 4 & 5 are equal.
d. They have the same measure.
e. Angles 3 & 7; Angles 2 & 6;
Angles 4 & 8
f. Alternate interior angles are
congruent. Alternate exterior angles
are congruent. Corresponding angles
are congruent.
“Think and Discuss”
1) answers vary
2) Angles 1, 4, 5, 8 = 55°
Angles 2, 3, 6, 7 = 125°
3) All angles measure 90°
Objective
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
4
3
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
Text p. 324, #1-23 all, 28, 29