# Ch 8: ACCESS Math Unit 8: Geometry

### About This Chapter

## How It Works:

- Identify the lessons in the ACCESS Math Geometry chapter with which you need help.
- Find the corresponding video lessons with this companion course chapter.
- Watch fun videos that cover the geometry topics you need to learn or review.
- Complete the quizzes to test your understanding.
- If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

## Students will learn:

- How to define parallel, perpendicular and transverse lines
- Definitions for obtuse, acute, right and straight angles
- What complementary and supplementary angles are
- The names of different kinds of triangles
- The properties of different shapes
- The formula for finding the sum of a polygon's angles
- Kinds of transformations in math
- The definition for tessellation

*ACCESS Math is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.*

### 1. Parallel, Perpendicular and Transverse Lines

What are the different types of lines? Where are they visible in the real world and how can you recognize them? Find out here and test your knowledge with a quiz.

### 2. What is a Right Angle? - Definition & Formula

In this lesson, you will learn about the properties that identify right angles. You will also discover where right angles can be found and learn about what makes them so useful. You can then test your knowledge with a quiz.

### 3. What is an Acute Angle? - Definition, Description & Examples

In this lesson, you'll learn what makes an angle acute and see a few different examples of them. After the lesson, you can test your new knowledge with a brief quiz.

### 4. What is a Straight Angle? - Definition & Example

This lesson will be an explanation of what a straight angle is. It will include several examples that fully demonstrate the straight angle in contrast with other angles.

### 5. What is an Obtuse Angle? - Definition & Examples

In this lesson, you'll learn what angles, right angles, and obtuse angles are; you'll see a few examples of different obtuse angles. Test your knowledge with a brief quiz once you've completed the lesson.

### 6. Complementary Angles: Definition, Theorem & Examples

In this lesson, we will define complementary angles and see how they may appear in diagrams. We will discuss two common theorems that involve complementary angles. Then you can test your knowledge with a quiz.

### 7. Supplementary Angle: Definition & Theorem

There are many important angle pairs in geometry. In this lesson, we'll learn about supplementary angles, including what they are, where they are used, and why you need to know about them.

### 8. 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.

### 9. Properties of Shapes: Quadrilaterals, Parallelograms, Trapezoids, Polygons

Four-sided objects are more than just squares and rectangles. In this lesson, we'll discuss quadrilaterals, parallelograms and trapezoids. We'll also discuss polygons, objects that can have more sides than you can count.

### 10. Properties of Congruent and Similar Shapes

In this lesson, we'll look at triangles, rectangles and other shapes that share properties. This includes both congruent and similar shapes. We'll also practice identifying the missing properties of these shapes.

### 11. 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.

### 12. Transformations in Math: Definition & Graph

In geometry, transformation refers to the movement of objects in the coordinate plane. This lesson will define and give examples of each of the four common transformations and end with a quiz to make sure you are moving in the right direction.

### 13. Tessellation: Definition & Examples

In this lesson you will learn what a tessellation is and how to determine whether or not a pattern is a tessellation. After looking at some examples, you can take a brief quiz to see what you learned.

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### Other Chapters

Other chapters within the ACCESS Math: Online Textbook Help course

- ACCESS Math Unit 1: Number Concepts
- ACCESS Math Unit 2: Introduction to Algebra
- ACCESS Math Unit 3: Decimals
- ACCESS Math Unit 4: Number Theory
- ACCESS Math Unit 5: Fractions & Mixed Numbers
- ACCESS Math Unit 6: Ratios, Proportions & Percents
- ACCESS Math Unit 7: Data & Statistics
- ACCESS Math Unit 9: Area & Volume
- ACCESS Math Unit 10: Probability
- ACCESS Math Unit 11: Integers
- ACCESS Math Unit 12: More Algebra