Lesson 9-3 Pages 447-451 Angles Lesson Check 9-2.

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Presentation transcript:

Lesson 9-3 Pages Angles Lesson Check 9-2

What you will learn! 1. How to measure and draw angles. 2. How to classify angles as acute, right, obtuse, or straight.

PointDegreeRayProtractor Line Acute angle Angle Right angle Vertex Obtuse angle Side Straight angle

What you really need to know! An angle is made up of two rays that have a common endpoint, called the vertex. The most common unit of measure for angles is the degree. There are 360° in a circle. Angles are measured using protractors.

S R W Example 1: Use a protractor to measure  RSW. 42°

U M Example 1B: Find the measures of  GUM,  SUM,  BUG. G S B

U M m  GUM=120°; m  SUM=32°; m  BUG=60°; G S B

Example 2: Draw  R having a measure of 145°. 145° R

Example 3: Classify the angle as acute, obtuse, right, or straight. Acute

Example 3: Classify the angle as acute, obtuse, right, or straight. Straight

Example 3: Classify the angle as acute, obtuse, right, or straight. Obtuse

Example 4: The diagram shows the angle between the back of a chair and the seat of the chair. Classify this angle. Obtuse

Page 449 Guided Practice #’s 3-9

Pages with someone at home and study examples! Read:

Homework: Pages #’s all #’s Practice Quiz 1 #’s 1-5 Lesson Check 9-3

Page 745 Lesson 9-3

Lesson Check 9-3