Ch 5: McDougal Littell Geometry Chapter 5: Properties of Triangles

About This Chapter

The Properties of Triangles chapter of this McDougal Littell Geometry Textbook companion course helps students learn essential geometry lessons of properties of triangles. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Properties of Triangles textbook chapter.

How it works:

  • Identify the lessons in the McDougal Littell Geometry Textbook Properties of Triangles chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the properties of triangles topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Perpendicular bisector theorem
  • Angle bisector theorem
  • Perpendicular bisectors of a triangle
  • Concurrency of perpendicular bisectors of a triangle
  • Concurrency of angle bisectors of a triangle
  • Constructing the median of a triangle
  • Median, altitude and angle bisectors of a triangle
  • Proving theorems about triangles: Triangle medians and the centroid
  • Identifying the mid-segments of a triangle
  • Proving theorems about triangles: Triangle mid-segments theorem
  • Comparing measurements of a triangle
  • Theorems of inequality
  • Triangle inequality
  • Using indirect proof
  • Hinge theorem

McDougal Littell Geometry is a registered trademark of McDougal Littell, which is not affiliated with

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.