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Ch 9: NY Regents - Parallel Lines and Polygons: Help and Review

About This Chapter

The Parallel Lines and Polygons chapter of this NY Regents Exam - Geometry Help and Review course is the simplest way to master parallel lines and polygons for the NY Regents Exam. This chapter uses simple and fun videos that are about five minutes long, plus lesson quizzes and a chapter exam to ensure students learn the essentials of parallel lines and polygons.

Who's it for?

Anyone who needs help learning or mastering geometry material for the NY Regents Exam will benefit from taking this course. There is no faster or easier way to learn high school geometry. Among those who would benefit are:

  • Students who have fallen behind in understanding theorems and proofs, or measuring area or angles
  • Students who struggle with learning disabilities or learning differences, including autism and ADHD
  • Students who prefer multiple ways of learning math (visual or auditory)
  • Students who have missed class time and need to catch up
  • Students who need an efficient way to learn about parallel lines and polygons for the NY Regents Exam
  • Students who struggle to understand their teachers
  • Students who attend schools without extra math learning resources

How it works:

  • Find videos in our course that cover what you need to learn or review.
  • Press play and watch the video lesson.
  • Refer to the video transcripts to reinforce your learning.
  • Test your understanding of each lesson with short quizzes.
  • Verify you're ready by completing the Parallel Lines and Polygons chapter exam.

Why it works:

  • Study Efficiently: Skip what you know, review what you don't.
  • Retain What You Learn: Engaging animations and real-life examples make topics easy to grasp.
  • Be Ready on Test Day: Use the Parallel Lines and Polygons chapter exam to be prepared.
  • Get Extra Support: Ask our subject-matter experts any parallel lines and polygons question. They're here to help!
  • Study With Flexibility: Watch videos on any web-ready device.

Students will review:

This chapter helps students review the concepts in a parallel lines and polygons unit of a standard high school geometry course. Topics covered include:

  • The parallel postulate and indirect proof
  • Angles formed by a transversal
  • Use of converse statements to prove that lines are parallel
  • Definition and examples of polygons
  • Measurement of a regular polygon's area and angles of a triangle
  • Measurement of polygon angles and discovery of the sum

11 Lessons in Chapter 9: NY Regents - Parallel Lines and Polygons: Help and Review
The Parallel Postulate: Definition & Examples

1. The Parallel Postulate: Definition & Examples

In this lesson, you will learn about an important postulate in Euclidean geometry, called the Parallel Postulate. It sounds kind of hard, but this lesson explains it in simple terms and provides several examples of it as well.

Angles Formed by a Transversal

2. Angles Formed by a Transversal

When you have a pair of parallel lines and a transversal, something very interesting happens to the angles that are formed. You can see this happen in real life at street intersections and such. Watch this video lesson to learn about all of this.

Parallel Lines: How to Prove Lines Are Parallel

3. Parallel Lines: How to Prove Lines Are Parallel

Watch this video lesson to learn how you can prove that two lines are parallel just by matching up pairs of angles. Learn which angles to pair up and what to look for.

Using Converse Statements to Prove Lines Are Parallel

4. Using Converse Statements to Prove Lines Are Parallel

Because a pair of parallel lines produces unique angle characteristics, we can use this information to our advantage. Watch this video lesson to see how we turn this advantage into converse statements to help us prove parallel lines.

What Are Polygons? - Definition and Examples

5. What Are Polygons? - Definition and Examples

Watch this video lesson to see how the shapes that you grew up with are all related. Learn why the shapes of bricks, stars, and street blocks are considered polygons while the sun, moon, and rolling hills are not.

Measuring the Area of Regular Polygons: Formula & Examples

6. Measuring the Area of Regular Polygons: Formula & Examples

Watch this video lesson to learn why a regular polygon makes your life easier when it comes to finding the area inside one. Learn the one formula for area that will work for any type of regular polygon.

Measuring the Angles of Triangles: 180 Degrees

7. Measuring the Angles of Triangles: 180 Degrees

Watch this video lesson to see why a triangle's angles always add up to 180 degrees. Also, learn how you can use this unique fact about triangles to find an unknown angle in a triangle.

How to Measure the Angles of a Polygon & Find the Sum

8. How to Measure the Angles of a Polygon & Find the Sum

Watch this video lesson to learn the one formula that lets you find the measure of angles in any regular polygon. Also, learn how you can tell if you are working with a regular polygon or not.

What is an Enneagon? - Definition & Formulas

9. What is an Enneagon? - Definition & Formulas

In this lesson you will discover the nine-sided geometrical shapes called enneagons and learn formulas for perimeter, exterior and interior angles, radial length and apothem.

Heptagon: Definition, Shapes & Examples

10. Heptagon: Definition, Shapes & Examples

In this lesson, you'll review the definition of polygons, and you'll learn what makes heptagons unique. You'll also distinguish between regular and irregular heptagons.

Hexagonal Prism: Properties, Formula & Examples

11. Hexagonal Prism: Properties, Formula & Examples

In this lesson, we will learn what a hexagonal prism is and what it looks like. You'll also become familiar with the surface area and volume formulas for this 3-dimensional shape. When you're done, you can even test your knowledge with a quiz!

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