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Chapter 1 Exploring Geometry: Points, Lines, and Angles in the Plane Section 3 Copying and Bisecting Angles Objectives: Students will be introduced to angles and be able to draw and bisect angles using a compass. Angle An angle () is a figure formed from two rays (called the sides of the angle) with the same endpoint (called the vertex of the angle). Side XW W X Vertex Point X Chapter 1 Y Side XY Section 3 - Copying and Bisecting Angles 2 Naming an Angle A B 1 C If there is only one angle at a vertex, you can use a single letter to name the vertex of the angle. B If there is more than one angle at a vertex, name the angle using three letters, with the middle letter being the vertex. ABC or CBA Vertex An angle can also be named by a number. 1 Chapter 1 Section 3 - Copying and Bisecting Angles 3 Example 1 1. Name the angle in as many ways as possible. Answer: R, 3, QRS, or SRQ 2. Name the sides and the vertex of the angle. Answer: Sides - RQ and RS Vertex - Point R Q R 3 S Chapter 1 Section 3 - Copying and Bisecting Angles 4