Chapter 8 - Similarity
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Chapter 8: Section Outline
Chapter 8: Section Outline
8.1 Similar Polygons
8.2 Proving Triangle Similarity by AA
8.3 Proving Triangle Similarity by SSS and SAS
8.4 Proportionality Theorems
Section Objectives
Section Objectives
8.1 – Similar Polygons
Students will identify similar polygons using corresponding side ratios and angle congruence, and use scale factors to solve problems (G.8A, G.8B).
8.2 – Proving Triangle Similarity by AA
Students will prove triangles are similar using the Angle-Angle (AA) similarity criterion and apply it to solve geometric problems (G.8A).
8.3 – Proving Triangle Similarity by SSS and SAS
Students will prove triangles are similar using Side-Side-Side (SSS) and Side-Angle-Side (SAS) similarity criteria and solve problems using proportional reasoning (G.8A, G.8B).
8.4 – Proportionality Theorems
Students will apply triangle proportionality theorems—including the Triangle Proportionality and Converse Theorem—to find missing segment lengths and justify reasoning (G.8B, G.8C).
TABLE OF CONTENTS:
TABLE OF CONTENTS:
📚 Not sure where to start? Click the section titles to access lessons, practice, and tools in one click.
📚 Not sure where to start? Click the section titles to access lessons, practice, and tools in one click.
Note Library
Note Library
Need a fresh copy of your notes? Click the buttons to download a PDF for each section.
Need a fresh copy of your notes? Click the buttons to download a PDF for each section.
These are the same guided notes we use in class—perfect for staying organized or catching up after an absence.
Independent Practice
Independent Practice
Practice assignments will appear here after we complete each lesson.
Practice assignments will appear here after we complete each lesson.
They may be worksheets or textbook problems, depending on the topic. Check back regularly to stay on track—no early access to homework!
💡 Remember: Always attempt the work on your own before checking the answers. These keys are here to support your learning—not replace it!
Textbook Library
Textbook Library
Access the textbook pages we’re using in class by clicking the buttons.
Access the textbook pages we’re using in class by clicking the buttons.
These pages match your Big Ideas Math textbook and are great for reviewing examples, completing assignments, or getting extra practice at home.
Video Resources
Video Resources
Watch the videos linked below for step-by-step examples, topic reviews, and helpful tips.
These videos align with what we’re learning in class and are great for getting ahead, extra support, review, or catching up if you’ve been absent.
Lesson_8.1.wmv8.1
Lesson_8.2_and_8.3_Lesson.wmv8.2 / 8.3
Lesson_8.4.wmv8.4
Note Answer Keys
Note Answer Keys
Missed something in class or were absent? Answer keys will be posted here at the end of the day we complete a lesson.
Missed something in class or were absent? Answer keys will be posted here at the end of the day we complete a lesson.
Use them to review, fill in anything you missed, and make sure your notes are complete and accurate.
Click on the section titles to jump to the notes you need. You can scroll through without opening a new window. Slides also include a home button to return to the main page for easy navigation.
Extra Materials & Resources
Extra Materials & Resources
Looking for more ways to practice or dive deeper? This section includes optional review sheets, challenge problems, formula reference pages, and other helpful tools to support your success in Algebra 1. Use these resources to strengthen your understanding or get ahead!
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