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Ch 29: CEOE Middle Level/Intermediate Math: Properties of Triangles

About This Chapter

This chapter is intended as a refresher for Oklahoma teachers or aspiring teachers in preparation for taking the Certification Examinations for Oklahoma Educators (CEOE) Middle Level/Intermediate Math test. In this chapter we discuss the properties of triangles.

CEOE Middle Level/Intermediate Math: Properties of Triangles - Chapter Summary

These short video lesson were developed especially for those who are preparing for the CEOE Middle Level/Intermediate Math certification test. After studying these videos, you will have more confidence and knowledge answering test questions on categories covered in the lessons, including:

  • The properties of triangles
  • How to classify triangles by angles and sides
  • Exterior and interior angles of triangles
  • Triangle median, altitude and angle bisectors
  • Theorem and formula for finding triangle centroids
  • Properties of the orthocenter in geometry
  • The use of theorem and proofs of triangle inequality

These 5-10 minute video lessons break the subject of triangles into manageable segments to aid your understanding. We give you a quiz on the lesson to check that you got the information. If you want to review any part of the lesson after the quiz, our intuitive timeline tool can take you right to the point you are looking for. There is also a feature that allows you to ask a question of the instructor.

8 Lessons in Chapter 29: CEOE Middle Level/Intermediate Math: Properties of Triangles
Test your knowledge with a 30-question chapter practice test
Triangles: Definition and Properties

1. Triangles: Definition and Properties

What makes a shape a triangle? In this lesson, we'll explore the definition of a triangle, then analyze the parts of triangles, including the vertices, base and height.

Classifying Triangles by Angles and Sides

2. Classifying Triangles by Angles and Sides

Not all triangles are the same. There are equilateral, isosceles and scalene triangles. Then there are right, acute and obtuse triangles. In this lesson, we'll learn how to classify triangles using their sides and angles.

Interior and Exterior Angles of Triangles: Definition & Examples

3. Interior and Exterior Angles of Triangles: Definition & Examples

Knowing just a few things about the interior or exterior angles of triangles is sometimes all you need to put all the pieces together. Find out more in this lesson.

Angles and Triangles: Practice Problems

4. Angles and Triangles: Practice Problems

Want more practice solving with angle pairs? How about more review for solving angles in triangles? Look no further. Get more practice here, and test your ability with a quiz.

Median, Altitude, and Angle Bisectors of a Triangle

5. Median, Altitude, and Angle Bisectors of a Triangle

Line segments in triangles are just clutter; they have special names and qualities depending on how they're drawn. In this lesson, we'll learn about medians, altitudes and angle bisectors.

Centroid: Definition, Theorem & Formula

6. Centroid: Definition, Theorem & Formula

Have you ever wondered how to find the balancing point of a triangle? The answer can be found in this lesson on the centroid of a triangle! We'll learn how medians are used to locate the centroid and then discuss its various properties.

Orthocenter in Geometry: Definition & Properties

7. Orthocenter in Geometry: Definition & Properties

This lesson involves a well-known center of a triangle called the orthocenter. Its definition and properties will be discussed, and an example will be worked showing how to find its location on a graph.

Triangle Inequality: Theorem & Proofs

8. Triangle Inequality: Theorem & Proofs

In this lesson, we will use definitions and proofs to learn what the triangle inequality theorem is, why it works, and how to use it to determine if three given line segments can form a triangle.

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

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Other Chapters

Other chapters within the OSAT Middle Level/Intermediate Mathematics (CEOE) (125): Practice & Study Guide course

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