Download 1.3 Angle Relationships

Year 2 warm up
copy the pictures
C
1. Name this angle 3 ways
CAT , A, TAC
T
A
2. If EB bisects <AEC and EC bisects
<AED and m< AEB = 25o then
A
25
B
25
E
50
D
C
2a. Find the m < BEC
25°
2b. Find the m < CED
50°
2c. Find the m < BED
75°
1.3 Angle Relationships


35°

150°
A right angle is an angle that
measures 90°.
An acute angle measures less than
0  x  90
90°.
An obtuse angle measures more
than 90° but less than 180°.
90  x  180
1.3 continued

Vertical angles are angles formed by two
intersecting lines. They share a common
vertex but not a common side. Vertical
angles are congruent.
3
1
2
4
1  2
3  4
1.3 continued

Two angles are a linear pair if they
share a vertex and a common side, and
their non-common sides form a line.
2
3,  4
 4, 5
6
3
5
4
1
5, 6
6, 3
1  2  180
These are
linear pairs
1.3 continued

A pair of complementary angles has
B
a sum of 90°.
A  B  90
20°
1 2  90
2
1

70°
A
A pair of supplementary angles has
a sum of 180°. C  D  180
C
3  4  180
30°
4
3
150°
D
1.3 continued

Parallel lines are lines in the same
plane that never meet.
3
3
4
4
Parallel lines have the same slope
1.3 continued

You can
also write:
l1  l2
l
Perpendicular lines are lines that
cross and form a 90° angle.
Perpendicular lines have opposite
3
and reciprocal slopes.
m
5
l2
l1
5
m
3
1.3 Summary



Write down in complete sentences
and in your own words 3 things that
you learned today.
Class work: worksheet 1.3
Homework: p. 51 1-8, 11-20, 26