Ch 31: 8th Grade Math: Triangles in Geometry

About This Chapter

This chapter's videos are designed to teach 8th graders all about triangles in a fun, light-hearted way. There are lesson quizzes and a chapter exam for you to use to measure what they have taken away from the chapter.

8th Grade Math: Triangles in Geometry - Chapter Summary

Do you want your students to understand triangles? The clever and short video lessons in this chapter strive to engage students while teaching them triangle parts, types, constructions, and techniques in ways they won't forget. You can determine your students' understanding by using multiple-choice quizzes and a chapter exam at the end of the lesson.

Chapter Lessons and Objectives

Lesson Objective
Triangles: Definition and Properties Students learn vocabulary terms related to triangles like adjacent, vertex, vertices, side, opposite, base, apex, and height.
Classifying Triangles by Angles and Sides With this lesson, students use the angles and sides of triangles to determine the triangle type.
Interior and Exterior Angles of Triangles: Definition and Examples Instructors explain how to identify the interior and exterior angles of triangles.
How to Identify Similar Triangles Students learn ways to identify similar triangles.
Angles and Triangles: Practice Problems Students have the chance to practice solving for angles and triangles.
Constructing the Median of a Triangle Chapter leads students through the steps of constructing the median of a triangle.
Median, Altitude, and Angle Bisectors of a Triangle Students learn the meanings of median, altitude, and angle bisectors and ways to identify them in a triangle.
Constructing Triangles: Types of Geometric Construction In this lesson, students learn to construct triangles using different combinations of given sides and angles.
Properties of Concurrent Lines in a Triangle Students examine some properties of concurrent lines in a triangle, such as centroid, altitude, angle bisector, incenter, and orthocenter.

9 Lessons in Chapter 31: 8th Grade Math: Triangles in Geometry
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.
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 8th Grade Math: Practice & Review course

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