Warm up:
1. Name two things in the room that are parallel to each other.
2. Name two things in the room that are skew to each other.
3. Name two things in the room that are perpendicular to each other.
Objective: Use theorems about perpendicular lines.
Theorem 3.1: All right angles are ______________________.
If ________________ and ________________, then ___________________________.
Theorem 3.2: If two lines are perpendicular, then they intersect to form ______________________________________.
If ________________, then ________________, ________________,________________, and ________________.
Step 1: Mark up ANY angle that you KNOW is a right angle.
Theorem 3.3: If two lines intersect to form adjacent congruent angles, then the lines are
_______________________________.
If ___________________, then ___________________________.
Theorem 3.4: If two sides of adjacent acute angles are perpendicular, then the angles are
_____________________________.
If ________________________, then _____________________________________.
10.
Define perpendicular lines.