Download Angle Properties and Straight Lines

Family Letters and
Activities
Chapter 6 Angle Properties and Straight Lines
Dear Family,
In this chapter, your student will learn about angles formed by pairs of
lines. Some of the skills your student will practice are:
• identifying properties of complementary, supplementary, adjacent,
and vertical angles
• identifying different types of angles formed by parallel lines and a
transversal
• investigating and applying the properties of interior and exterior
angles of a triangle
Vocabulary to
Practice
If the measures of ∠A and ∠B
o
add up to 90 , ∠A is called
the complement of ∠B. If
o
they add up to 180 , then ∠A
is the supplement of ∠B.
In the diagram below, ∠2
and ∠4 are a pair of vertical
angles.
1
4
Activity
2
3
Identifying the angles formed by two lines and a transversal is a skill
that students will use in classes involving geometry. You can help your
student learn this skill with this activity.
• Draw two parallel lines and a transversal.
When two lines in a plane are
intersected by a transversal,
the angles formed have
specific names (see the
activity on this page).
• Choose one of the pairs of angles formed, as shown below, and ask
your student the name of the pair of angles. You can also use a pair
© Marshall Cavendish International (Singapore) Private Limited.
of adjacent angles or vertical angles.
1
3 4
2
∠1 and ∠2 are a pair of
corresponding angles.
5
∠3 and ∠4 are a pair of
alternate interior angles.
7
8
6
∠5 and ∠6 are a pair of
alternate exterior angles. Math in Focus® Course 2
(M)MIF_FLA2_Eng.indd 6
Online Resources
For additional Parent
∠7 and∠8 are a pair of
Resources my.hrw.com
adjacent angles.
Family Letters and Activities
11/23/11 6:52 AM