Read this article and watch the videos. Pay attention to the definitions of midsegment, the midsegment theorem, and how to calculate the length of a midsegment. Review examples 1–5 to see how to use the midsegment theorem to solve for unknown quantities in triangles.
Then, complete review questions 5, 6, 9, 10, and 16, and check your answers.
Click https://www.ck12.org/geometry/Midsegment-Theorem/lesson/Midsegment-Theorem-BSC-GEOM/ link to open resource.