# Ch 28: Triangles

Our video lessons and quizzes can teach you about triangles, including the formulas and theorems you'll need to solve problems of distance and measurement. Use these lessons to understand the fundamental properties of triangles.

## Triangles - Chapter Summary

The lessons in this chapter cover basic trigonometry, which is the study of triangles. You'll learn how to use the properties of points, lines, planes, angles, lengths and distances to solve problems. The Pythagorean Theorem and how to use it is explored, as are the laws of sines and cosines. You'll learn about right angle trigonometry and proportional reasoning and how you can use their principles to solve measurement problems.

Several practice lessons are included in this chapter to give you experience solving problems with triangles. By the time you've finished all the lessons, you should have a solid understanding of concepts including:

• Ratios and similarities in trigonometry
• Sines and cosines of complementary angles
• Definition of the Pythagorean Theorem and its importance
• Application of the Pythagorean Theorem
• Solving right triangles
• Using A = ½ ab sin C to find area
• Laws of Sines and Cosines and how to apply them

These concise, engaging videos cover the basics of working with triangles, with experienced instructors who use real life examples to explain the concepts. Each lesson is accompanied by a written transcript, giving you another option for accessing this material.

Practice lessons allow you to utilize what you've studied, and there are multiple-choice quizzes at the end of each video. The questions are linked back to the lesson, making it easy to find and review key topics without re-watching the entire video.

9 Lessons in Chapter 28: Triangles
Test your knowledge with a 30-question chapter practice test
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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