Upload
esther-garrett
View
229
Download
0
Embed Size (px)
DESCRIPTION
Formally define geometric figures.
Citation preview
Lesson 3-2Lesson 3-2Angles and Parallel LinesAngles and Parallel Lines
Ohio Content Standards:
Ohio Content Standards:
Formally define geometric figures.
Ohio Content Standards:
Recognize and apply angle relationships in situations involving intersecting lines, perpendicular lines and parallel lines.
Ohio Content Standards:
Recognize the angles formed and the relationship between the angles when two lines intersect and when parallel lines are
cut by a transversal.
Postulate 3.1
Postulate 3.1
Corresponding Angles PostulateIf two parallel lines are cut by
a transversal, then each pair of corresponding angles are
congruent.
Postulate 3.1
Corresponding Angles PostulateIf two parallel lines are cut by
a transversal, then each pair of corresponding angles are
congruent.1
4
58
.16 theFind
51. 11 and y figure, In the
m
mx
10
13
1417
1112
1516
x
y
z
Theorem 3.1
Theorem 3.1
Alternate Interior Angles Theorem
If two parallel lines are cut by a transversal, then each pair of alternate interior angles are
congruent.
Theorem 3.1
Alternate Interior Angles Theorem
If two parallel lines are cut by a transversal, then each pair of alternate interior angles are
congruent.3 4
5 6
Theorem 3.2
Theorem 3.2
Consecutive Interior Angles TheoremIf two parallel lines are cut by a
transversal, then each pair of consecutive interior angles is
supplementary.
Theorem 3.2
Consecutive Interior Angles TheoremIf two parallel lines are cut by a
transversal, then each pair of consecutive interior angles is
supplementary.
3 4
5 6
Theorem 3.3
Theorem 3.3
Alternate Exterior Angles Theorem
If two parallel lines are cut by a transversal, then each pair of alternate exterior angles are
congruent.
Theorem 3.3
Alternate Exterior Angles Theorem
If two parallel lines are cut by a transversal, then each pair of alternate exterior angles are
congruent.1 2
7 8
Theorem 3.4
Theorem 3.4
Perpendicular Transversal Theorem
In a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other.
Theorem 3.4
Perpendicular Transversal Theorem
In a plane, if a line is perpendicular to one of two parallel lines, then it is perpendicular to the other.l
n
m
? of measure theisWhat RTV
V
65°
R
P
U
S 60°
M
T
N
Q
. and find,157 and ),25(46 ,1025 If
yxxmymxm
6
7
5
m
p
q
n
Assignment:
Pgs. 136-138 14-34 evens, 48-58 evens