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Ch 31: ACT Math: Triangles

About This Chapter

Get ready to answer questions about triangles on your ACT Math exam with this chapter filled with quick and fun interactive video lessons. The end of the lessons contain comprehensive quizzes you can use to practice answering questions much like the ones on your exam.

ACT Math: Triangles - Chapter Summary

Do you remember items like the specific properties of triangles, ways to tell if a shape is a similar triangle, and types of special right triangles? Well, this chapter includes vibrant lessons to help you review these concepts, as well as others to prepare for the ACT Math exam. Your completion of the lessons indicates you are ready to take the quizzes to measure what you know. The other items you will find in this chapter include these:

  • Area and perimeter of triangles and rectangles
  • Utilization of the Pythagorean theorem to determine distance
  • Applications involving similar triangles
  • Practice of the Pythagorean theorem
  • Uses of 3-4-5 triangles

Use the timelines to go over different topics in the videos without having to view them in their entirety each time. You can check the parts of the lessons that contain the answers to your quizzes by clicking the Watch Answer links. You can find information about the instructors at the top of transcripts. Contact them if you have any questions about the chapter.

11 Lessons in Chapter 31: ACT Math: Triangles
Test your knowledge with a 30-question chapter practice test
Properties of Shapes: Triangles

1. Properties of Shapes: Triangles

Isosceles, equilateral and obtuse, oh my! These are terms for triangles. But, what do they mean? In this lesson, we'll explore the properties of triangles and take a closer look at the different types of triangles you may encounter.

Perimeter of Triangles and Rectangles

2. Perimeter of Triangles and Rectangles

Without realizing it, we calculate and use the perimeter of triangles and rectangles in regular everyday situations. Learn more about the perimeter of triangles and rectangles in this lesson, and test your knowledge with a quiz.

Area of Triangles and Rectangles

3. Area of Triangles and Rectangles

How do you find out the area of rectangles and triangles? Learn how in this lesson! We'll look at the formulas, then practice solving problems for each shape.

Combined Figures: Perimeter, Area, and Volume

4. Combined Figures: Perimeter, Area, and Volume

Watch this video lesson to learn how you can break up the shapes in a combined figure to easily find the perimeter, area, and volume of the whole figure.

Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures

5. Applying Scale Factors to Perimeter, Area, and Volume of Similar Figures

How do shapes change sizes yet retain their proportions and similarities to other shapes? In this lesson, we'll look at what a scale factor is and how to apply it. We'll consider scale factors with regards to three different aspects of similar shapes: perimeter, area and volume.

Finding Distance with the Pythagorean Theorem

6. Finding Distance with the Pythagorean Theorem

How much faster is it to cut the corners in a race around the block? In this lesson, review the Pythagorean Theorem, and figure out how to solve without a right triangle.

Applications of Similar Triangles

7. Applications of Similar Triangles

Similar triangles are used to solve problems in everyday situations. Learn how to solve with similar triangles here, and then test your understanding with a quiz.

How to Identify Similar Triangles

8. 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.

The Pythagorean Theorem: Practice and Application

9. The Pythagorean Theorem: Practice and Application

The Pythagorean theorem is one of the most famous geometric theorems. Written by the Greek mathematician Pythagoras, this theorem makes it possible to find a missing side length of a right triangle. Learn more about the famous theorem here and test your understanding with a quiz.

Special Right Triangles: Types and Properties

10. Special Right Triangles: Types and Properties

Not all right triangles are the same. In this lesson, we'll look at two special right triangles (30-60-90 and 45-45-90) that have unique properties to help you quickly and easily solve certain triangle problems.

Properties of 3-4-5 Triangles: Definition and Uses

11. Properties of 3-4-5 Triangles: Definition and Uses

Are you up to speed on your Pythagorean triples? If you could use a little help with that, watch this lesson to learn what 3-4-5 triangles are, how they're used, and why they're important.

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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