1. Module 14: Lesson 1 Angles Formed by Intersecting Lines
An angle is made up of 2 sides that are rays and a vertex.
Side: ray
Side: ray
Ray: Part of a line that has an endpoint and extends forever in one direction.
Vertex
Vertex: The common endpoint of the sides of an angle.

2. Vertical Angles: The nonadjacent angles formed by intersecting lines.
Congruent: Having the same size and shape 2 3 1 4
All vertical angles are congruent.

3. Supplementary Angles: 2 or more angles whose measures have a sum of 180°
Adjacent Angles: 2 angle with a common vertex and a common side, but no common interior points. 2 3
Linear Pair: 2 angles that form a straight line and share a common vertex. 1 4
All linear pairs are supplementary

4. Statement Reason 2 3 1 Given Definition of a linear pair
All linear pairs are supplementary
Definition of supplementary
Substitution
Subtraction property of equality
Definition of congruency 4

5. What is the measure of
121° 3 1 4

6. Complementary Angles: 2 or more angles whose measures have a sum of 90°B C D E A F G
Angles must be described with 3 letters. The 1st letter is a point one of the sides goes through, the 2nd letter is the vertex, and the 3rd letter is a point on the other side. There is an exception. C A B

7. Do Explain problem on page 681.

8. Homework pages 683-687 #1-20 (all)