Ch 32: TACHS: Triangles

About This Chapter

Review fun video lessons to learn more about triangles. This chapter explores angles, median, altitude and more to help you study for the TACHS test in New York.

TACHS: Triangles - Chapter Summary

Make sure you're ready to tackle questions related to triangles on the TACHS test by watching the short video lessons in this chapter. In no time, you will have the knowledge to do the following:

  • Analyze the properties associated with triangles
  • Classify triangles by angles and sides
  • Exhibit your understanding of interior and exterior angles of triangles
  • Identify similar triangles and solve problems involving angles and triangles
  • Construct triangles and the median of a triangle
  • Examine the median, altitude and angle bisectors of a triangle
  • Explore the properties of concurrent lines in a triangle

Instructors present the comprehensive lessons in a visually exciting manner that makes studying for the test fun and effective. Watch them on your computer, or on the go via your smartphone or tablet.

TACHS: Triangles Objectives

The TACHS test is a multiple-choice exam that gauges the language, ability, math and reading comprehension of 8th grade students. The test helps administrators decide whether students are eligible to attend one of the Catholic high schools in the Diocese of Brooklyn/Queens or Archdiocese of New York. Topics in this chapter help students prepare for questions in the math section of the test, which explores estimation, problem solving, data interpretation and more.

You can watch the short lessons in their video form, or review full lesson transcripts with helpful vocabulary words. Lesson quizzes and a chapter exam are also available to assess your comprehension of the lessons. If you have any questions about topics covered in this chapter, experts are ready to offer assistance.

9 Lessons in Chapter 32: TACHS: 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.
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