5.1 midsegment

MR. SAUCEDOGEOMETRY

MILBY HIGH SCHOOL

Midsegmentin triangles

OBJECTIVE

To find measurements of triangles using its midsegments.

WHAT IS A MIDSEGMENT?

A TRIANGLE HAS 3 MIDSEGMENTS

MIDSEGMENT LAB

Work in groups of 4You will have 25 minutes to complete lab.

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:

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=_____

GUIDED EXAMPLE

If MP=2x-1, and BC=3x+5, what is MP and BC?

If AD= 2x+4 and DB=3x-1, what is FE?

INDEPENDENT PRACTICE

HOMEWORK

Section 5.1, page 8-86Problems 1 – 9, 15

Pre AP: Add problem 19