Download - Lesson 10-3 Pages 422-425

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Lesson 10-3 Pages 422-425

Angle Relationships

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What you will learn!

How to identify and apply angle relationships.

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Vertical anglesVertical anglesCongruent anglesCongruent anglesSupplementary anglesSupplementary anglesComplementary anglesComplementary angles

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What you really need to know!

Angles that have the same measure are called congruent angles.

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

What you really need to know!

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

What you really need to know!

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What you really need to know!

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

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Vertical Angles!

RightLeft

Up

Down

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

Example 1:

128° 52°

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

Example 2:

yx

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Example 3:

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

180° - 56° = m RQS

124° = m RQS

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Example 4:

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

70°x 90° - 70° = x

20° = x

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Guided Practice

#’s 3-9

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Pages 422-423 with someone at home and study

examples!

Read:

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Homework: Page 424-425

#’s 10-27 all

#’s 30-42

Lesson Check 10-3

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Link to Lesson 10-3 Review Problems

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Lesson 10-3