Lesson: Triangle Midsegment Theorems Mathematics

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In this lesson, we will learn how to use the triangle midsegment theorem to prove the parallelism of lines in a triangle or find a missing side length.

Lesson Plan

Students will be able to

understand and prove that the straight line segment passing through the midpoint of one side of a triangle that is also parallel to another side of the triangle bisects the third side of the triangle,
understand and prove that the straight line segment connecting the midpoints of two sides of a triangle is parallel to the other side and is half its length,
use the triangle midsegment theorems to solve problems,
prove geometric properties using the triangle midsegment theorems.