Lesson 10-3 Pages 422-425

Angle Relationships

What you will learn!

How to identify and apply angle relationships.

Vertical anglesVertical anglesCongruent anglesCongruent anglesSupplementary anglesSupplementary anglesComplementary anglesComplementary angles

What you really need to know!

Angles that have the same measure are called congruent angles.

Two angles are supplementary if the sum of their measures is 180.

What you really need to know!

Two angles are complementary if the sum of their measures is 90.

What you really need to know!

What you really need to know!

When two lines intersect, they form two pairs of opposite angles called vertical angles, which are always congruent.

Vertical Angles!

RightLeft

Up

Down

Classify the pair of angles as complementary, supplementary, or neither.

Example 1:

128° 52°

Classify the pair of angles as complementary, supplementary, or neither.

Example 2:

yx

Example 3:

Angles PQS and RQS are supplementary. If m PQS = 56°, find m RQS.

180° - 56° = m RQS

124° = m RQS

Example 4:

The rectangle shown is divided by a diagonal. Find the value of x.

70°x 90° - 70° = x

20° = x

Page 424

Guided Practice

#’s 3-9

Pages 422-423 with someone at home and study

examples!

Read:

Homework: Page 424-425

#’s 10-27 all

#’s 30-42

Lesson Check 10-3

Link to Lesson 10-3 Review Problems

Page

587

Lesson 10-3