# 1.2 Poolroom Math: Angles - Chandler Unified School District Warm up Lesson 1.2 1. List two words that are synonyms for a point. 2. What building block makes up a line? 3. Draw a pair of points that are collinear.

4. Why is a ray of sunshine called a ray? Warm up Answers 1. Dot, location 2. Points

3. 4. The light starts at the sun and continues out forever in one direction. 1.2 Poolroom Math: Angles Year 2 1.2 Poolroom Math An angle is formed by two rays that share a common endpoint.

The vertex of the angle is the common endpoint of the two rays. 37 Angles are measured in degrees. Angles that have the same measure are called congruent angles. 1.2 continued

An 49 49 angle bisector is a ray that divides an angle into two congruent angles. 1.2 Continued 3 methods to name an angle 1. Use three points that make up that angle, the vertex must be in the middle C

B < ABC or < CBA A 2. Use the number or letter in the interior of the angle <2 2 3. Use a single letter (be careful about other angles) A

F 1.2 continued Complete Example 1 in your notes. One of you will be called to the board. R U 1 V

T 1.2 continued Complete example #2. a) b) Name each angle bisector and the angle it bisects. If m YCD 200 , then m DCA ____

N D A Y C 1.2 continued A Protractor is a geometric tool used to measure an angle and to draw an angle.

Follow the directions on your notes and measure the two angles. After you have measured the angles, follow the directions from Example 3 and draw two angles. 1.2 Summary Write down in complete sentences and in your own words 3 things that you learned today.

1.2 Homework Pg. 42-44 #1-24, 30-33