1. What are some special parts of triangles, and how do we label them? Do Now: 1.Write HW in agenda. 2.Put your HW out on your desk. 3.Complete today’s Do Now sheet. Take out: pencil, do now sheet, homework (will be collected) Tonight’s Homework: Median and Midsegment HW worksheet 9 th Grade Geometry Monday - 10/18/10 Objectives: Draw, label, and define the median and/or midsegment of a triangle. Solve problem using the definition of a midsegment, median, perpendicular bisector. Agenda: 1. Do Now – Pre- Assessment (10 min) 2. New Vocab Powerpoint (15 min) 3. Perpendicular Bisector Investigation (15 min) 4. Practice Problems to be finished for HW (10 min)

2. Triangle Vocabulary

3. Median In the description box write a description of median by looking at the picture in your own words. Now draw a picture of one in the picture box

4. Midsegment In the description box write a description of midsegment by looking at the picture in your own words. Now draw a picture of one in the picture box

5. Midsegment Continued A midsegment ofa triangle is a segment that connects thetrianglesegment midpoints of two sides of a triangle A midsegment connecting two sides of a triangle is parallel to the third side and is half as long.

6. Altitude Description: A line segment that goes from a vertex to the base of a triangle and creates a 90 degree angle In the description box write a description of median by reading the definition and putting it in your own words. Now draw a picture of one in the picture box

7. Perpendicular Bisector In the description box write a description of perpendicular bisector by looking at the picture. Now draw a picture of one in the picture box

8. Perpendicular Bisector Investigation Expectations Take out : pencil 1 piece of patty paper Ruler Expectations: 1)First pick a reader for your group. This person will: 1)Read all instructions BEFORE anyone starts 2)Make sure everyone is on the same step at the same time 3)No off topic conversations 4)If you have a question, I will only come to your group when ALL members of the group are raising their hands. 5)When you are finished, everyone should raise their hand and I will bring you the HW. 9 th Grade Geometry Monday - 10/18/10 Objectives: Draw, label, and define the median and/or midsegment of a triangle. Solve problem using the definition of a midsegment, median, perpendicular bisector.