Module 14 Lesson 1 Angles Formed by Intersecting
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 Vertex Ray: Part of a line that has an endpoint and extends forever in one direction. Vertex: The common endpoint of the sides of an angle.
Vertical Angles: The nonadjacent angles formed by intersecting lines. 1 All vertical angles are congruent. 2 4 3 Congruent means having the same size and shape…like a clone.
Supplementary Angles: 2 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. 1 2 4 3 All linear pairs are supplementary Linear Pair: 2 angles that form a straight line and share a common vertex.
What is the measure of 121° 3 1 4
Complementary Angles: 2 angles whose measures have a sum of 90° B C D E A G C A B F Angles must be described with 3 letters. The 1 st letter is a point one of the sides goes through, the 2 nd letter is the vertex, and the 3 rd letter is a point on the other side. There is an exception.
Statement Reason Given Definition of a linear pair All linear pairs are supplementary Definition of supplementary Substitution Subtraction property of equality Definition of congruency 1 2 4 3
Do Explain problem on page 681.
Homework pages 683 -687 #1 -20 (all)
- Slides: 8