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Ch 27: NES Essential Academic Skills Math: Triangles

About This Chapter

Get reacquainted with triangles with the help of engaging video lessons. You can refresh your knowledge of interior and exterior angles, similar triangles and more as you prepare for the NES Essential Academic Skills Subtest III Math exam.

NES Essential Academic Skills Math: Triangles - Chapter Summary

This chapter can help you revisit triangle concepts you haven't explored in months or years. Watch the lessons to ensure you're ready to answer questions on the NES Essential Academic Skills Subtest III Math exam that address the following:

  • Defining and explaining the properties of triangles
  • Understanding how to classify triangles by angles and sides
  • Examining triangles' interior and exterior angles
  • Identifying similar triangles
  • Analyzing the median, altitude and angle bisectors of a triangle
  • Describing the properties of concurrent lines in a triangle

In addition to watching the videos, take advantage of written transcripts you can print and use for taking notes and highlighting key concepts. If you have any questions about triangle topics, our instructors are here to help.

NES Essential Academic Skills Math: Triangles - Chapter Objectives

The NES Essential Academic Skills Subtest III Math exam is used by many states to gauge prospective educators' comprehension of math as they aim to secure educator certification. Earning a passing score of 220 or higher on this subtest, along with three others, is often required to teach in the classroom setting. Increase your chances of succeeding on the test by reviewing the lessons in this chapter, which feature topics found in the competency area on measurement and geometry.

The computer-based subtest consists of 45 multiple-choice questions and lasts one hour. You can take the lesson quizzes and practice exam in this chapter to assess your ability to answer triangle-related questions on the subtest. Any questions you have about lesson topics can be submitted to experts who are eager to help.

6 Lessons in Chapter 27: NES Essential Academic Skills Math: 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.

How to Identify Similar Triangles

4. How to Identify Similar Triangles

Similar triangles have the same characteristics as similar figures but can be identified much more easily. Learn the shortcuts for identifying similar triangles 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.

Properties of Concurrent Lines in a Triangle

6. Properties of Concurrent Lines in a Triangle

Centroids, orthocenters, incenters, circumcenters, oh my! Don't worry though. In this lesson, we master the various terms for concurrent lines in triangles and match them to altitudes, angle bisectors, perpendicular bisectors and medians.

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

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Other Chapters

Other chapters within the NES Essential Academic Skills Mathematics Subtest 3 (003): Practice & Study Guide course

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