Informal Geometry

1
Informal Geometry

• Goal Identify angles formed by transversals

2
Vocabulary

• Transversal a line that crosses two or more
  other lines

3
Vocabulary

• Corresponding angles in the same position

4
Vocabulary

• Alternate interior angles between the lines on
  opposite sides

5
Vocabulary

• Alternate exterior angles outside the lines on
  opposite sides

6
Vocabulary

• Same-side interior angles between the lines on
  the same side

7
Vocabulary

• Same-side exterior angles outside the lines on
  the same side

8
In Class Assignment

• 123 (9-15)

9
Activity

• On a sheet of lined paper trace two lines with
  your pencil
• Draw a transversal
• Measure all 8 angles
• Which angles are congruent?

10
The Big Idea

• All the acute angles are congruent
• All the obtuse angles are congruent

11
Homework

• 132 (16-25)