1. CONSTRUCTION DAY! Segment and Angle Bisectors LEARNING TARGETS: 1. I will be able to construct line segment bisectors and angle bisectors with a compass and straightedge.

2. Video Constructing Line Segment Bisectors: http://www.youtube.com/watch?v=5bvjnleM n5A&feature=related http://www.youtube.com/watch?v=5bvjnleM n5A&feature=related

3. STEP 1: Set your compass width to more than half of the length of the segment you are trying to duplicate. AB

4. STEP 2: Place the needle end of your compass on point A and make a half circle with the compass. AB

5. STEP 3: Place the needle end of your compass on point B and make a half circle with the compass. AB

6. STEP 4: Make two points where each arc intersects. AB

7. STEP 5: Connect the two points with a line using your straightedge. AB

8. Conclusion: Segment AB is divided into two congruent segments. AB

9. Guided Practice: Complete problem #1 on your Construction Worksheet using a compass and straightedge together with the teacher.Complete problem #1 on your Construction Worksheet using a compass and straightedge together with the teacher. AB

10. Video Constructing Angle Bisectors: http://www.youtube.com/watch?v=z8y2me2 XFYE&feature=related http://www.youtube.com/watch?v=z8y2me2 XFYE&feature=related

11. STEP 1: Set your compass to a default length. Set your needle on the vertex of the angle and draw an arc that intersects both rays. A

12. STEP 2: Set your compass to a default length (you may keep it the same length). Set your needle on each of the angle’s rays and the intersection of the arc. Make a small arc in the middle of the angle. A

13. STEP 3: Make a point at where the two small arcs intersect. Draw a ray from the angle’s vertex through the point you just created. A

14. CONCLUSION: Angle A is now cut in half and there is now two congruent angles. A

15. Guided Practice: Complete problem #2 on your Construction Worksheet using a compass and straightedge together with the teacher.Complete problem #2 on your Construction Worksheet using a compass and straightedge together with the teacher. A

16. Cooperative Learning Problems #3-6 on Constructions Worksheet Problems #3-6 on Constructions Worksheet Use Compass and Straightedge. Use Compass and Straightedge.

17. HOMEWORK Lessons 2.1 and 2.2 Review Worksheet Lessons 2.1 and 2.2 Review Worksheet Due Thursday, 10/20 Due Thursday, 10/20