Chapter 3 3-2 Angles formed by parallel lines

and transversal

SAT Problem of the day O An isosceles triangle has sides

lengths 5,11, and x. How many possible values of x exists?

O A)OneO B)TwoO C)ThreeO D)Four O E) More than four

Solution to the SATO Right Answer: A

Objectives O Prove and use theorems about the

angles formed by parallel lines and a transversal.

Corresponding angles

Example 1: Using the Corresponding Angles

O Find each angle measure.O A) mECF

O B) mDCE

Example#2Find mQRS.

Student guided practice

O Do problems 1 and 2 from your book page 158

Angles O Remember that postulates are

statements that are accepted without proof.

O Since the Corresponding Angles Postulate is given as a postulate, it can be used to prove the next three theorems.

Example#3O Example 3: Finding Angle Measures

O Find each angle measure.O A. mEDGO B. mBDG

Example#4O Find mABD.

Student Guided Practice

O Do problem #4 on your book page 158

Homework!!O DO problems 6 to 11 in your book

page 158

Closure O Today we learned about angles

formed by a transversal.O Next class we are going to learn

proving lines parallel