Ch 42: WEST Middle Grades Math: Triangles

About This Chapter

Use these accessible, fun-sized video lessons to study the triangle concepts you're likely to be tested on when you take your WEST Middle Grades Math assessment. Our instructors are here to assist you - please let them know any time you have questions or need guidance.

WEST Middle Grades Math: Triangles - Chapter Summary

This chapter uses enticing video lessons to make your study of triangles effective and fun. Lessons cover the concepts you'll likely run into on the WEST Middle Grades Math assessment, such as:

  • Triangle properties and classifications
  • Interior and exterior angles
  • Identifying similar triangles
  • How to construct the median of a triangle
  • Altitude, mean and angle bisectors
  • Triangle and geometric construction

Test your understanding of the concepts by taking the short, multiple-choice self-assessment after each lesson. Reach out to our instructors if you need any help with the material.

Objectives of the WEST Middle Grades Math: Triangles Chapter

Measurement and geometry questions make up 25% of the WEST Middle Grades Math certification exam. Use this chapter to review the triangle ideas likely to appear on the test and to introduce yourself to the exam format - our lesson quizzes mimic the WEST style so you can get comfortable with it.

The computer-administered assessment includes three other content areas: statistics, probability and discrete math (25%); number sense and operations (17%); and algebra and functions (33%). There are 150 tasks in total, and you'll be given four and a quarter hours to finish them all.

9 Lessons in Chapter 42: WEST Middle Grades 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.

Angles and Triangles: Practice Problems

5. 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.

Constructing the Median of a Triangle

6. Constructing the Median of a Triangle

If you have one triangle and want to divide it, you can use a median line. Medians have special geometric properties that we'll learn about in this lesson.

Median, Altitude, and Angle Bisectors of a Triangle

7. 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.

Constructing Triangles: Types of Geometric Construction

8. Constructing Triangles: Types of Geometric Construction

When you're asked to construct a triangle, it's time to break out that compass and straight edge! In this lesson, find out how to construct triangles no matter what you're given.

Properties of Concurrent Lines in a Triangle

9. 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.
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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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