5.1 midsegment
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This document provides instructions for a lesson on midsegments in triangles. It defines what a midsegment is, notes that triangles have three midsegments, and outlines a lab for students to complete in groups to learn about the midsegment theorem. The theorem states that the segment connecting the midpoints of two sides of a triangle is parallel to the third side and is half as long. The document includes example problems for students to practice applying the midsegment theorem.
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5.1 midsegment
- 1. Midsegment in triangles MR. SAUCEDO GEOMETRY MILBY HIGH SCHOOL
- 2. OBJECTIVE To find measurements of triangles using its midsegments.
- 3. WHAT IS A MIDSEGMENT?
- 4. A TRIANGLE HAS 3 MIDSEGMENTS
- 5. MIDSEGMENT LAB Work in groups of 4 You will have 25 minutes to complete lab.
- 6. MIDSEGMENT THEOREM Definition: The segment connecting the midpoints of two sides of a triangle is parallel to the third side and is half as long as that side. VISUAL:
- 7. CHECKPOINT All lines inside triangle ABC are midsegments. 1. What is the midsegment of AB: ______ 2. Line FE is parallel to _____ 3. Line FD is parallel to _____ 4. Line DE is parallel to _____ 5. If FE = 5, then AB= ____ 6. If FD=10, then CE= ____ 7. If AB=30, then FE= ____ 8. If CA=12, then DE=_____
- 8. GUIDED EXAMPLE If MP=2x-1, and BC=3x+5, what is MP and BC?
- 9. If AD= 2x+4 and DB=3x-1, what is FE?
- 11. HOMEWORK Section 5.1, page 8-86 Problems 1 – 9, 15 Pre AP: Add problem 19