Bell Work

• In your group, solve the following problems. The color indicate the person that’ll write the answer to the question.

• (4 questions about line segments: One with midpoint, one with entire length, one question about labeling congruent parts, one midpoint set up)

Chapter 1.6 Measuring Angles

13.0 Students prove relationships between angles by using properties of complementary, supplementary and

vertical angles

Vocabulary

• Angle: formed by two rays with the same endpoint– Symbol:

– Examples:

Vocabulary

• Acute angle: angle between 0 degrees and 90 degrees, 0<x<90

Vocabulary

• Right angle: Angle that is 90 degrees; x=90

Vocabulary

• Obtuse angle: angle between 90 degrees and 180 degrees; 90<x<180

Vocabulary

• Straight angle: angle that is 180 degrees; x=180

Vocabulary

• Congruent angles: angles with the same measure

Vocabulary

• Vertical angles: two angles whose sides are opposite rays

Which angles are vertical angle?

Vocabulary

• Adjacent angles: two coplanar angles with a common side, a common vertex, and no common interior points

Which angles are adjacent angles?

Vocabulary

• Complementary angles: two angles whose measures have sum 90

Vocabulary

• Supplementary angles: two angles whose measures have sum 180

Interwrite Activity: Naming Angles

Activity (5 min)

• Write the summary about this section in your Cornell note.

• Some questions to consider:– What is the topic about?– What did I learn from this lesson?– What questions do I have?

Homework

• P40 #1-8, 13-23, 24-32 even