Embedded Files
Chapter 9: Section Outline
Chapter 9: Section Outline
9.1 The Pythagorean Theorem
9.2 Special Right Triangles
9.3 Similar Right Triangles
9.4 The Tangent Ratio
9.6 Solving Right Triangles
Section Objectives
Section Objectives
9.1 – The Pythagorean Theorem
Students will apply the Pythagorean Theorem and its converse to find missing side lengths and determine whether a triangle is a right triangle (G.8D).
9.2 – Special Right Triangles
Students will solve problems involving 45-45-90 and 30-60-90 special right triangles using geometric relationships and proportional reasoning (G.8E).
9.3 – Similar Right Triangles
Students will use geometric means and relationships in similar right triangles to solve problems and prove triangle similarity (G.8A, G.8B).
9.4 – The Tangent Ratio
Students will define and apply the tangent ratio to solve for unknown sides or angles in right triangles (G.8F).
9.5 – The Sine and Cosine Ratios
Students will define and apply sine and cosine ratios to find missing sides and angles in right triangles using trigonometric relationships (G.8F).
9.6 – Solving Right Triangles
Students will solve right triangles by applying the Pythagorean Theorem, special right triangle rules, and trigonometric ratios (G.8D, G.8E, G.8F).
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_9.1.wmv9.1
Lesson_9.2.wmv9.2
Lesson_9.3.wmv9.3
Lesson_9.4_and_9.5.wmv9.4-9.5
Lesson_9.6.wmv9.6
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!
Page updated
Report abuse