Lesson Planet
Search educational resources
  • Sign In Try It Free
  • AI Teacher Tools
    • Discover Resources Search reviewed educational resources by keyword, subject, grade, type, and more
    • Curriculum Manager (My Content) Manage saved and uploaded resources and folders To Access the Curriculum Manager Sign In or Join Now
    • Browse Resource Directory Browse educational resources by subject and topic
    • Curriculum Calendar Explore curriculum resources by date
    • Lesson Planning Articles Timely and inspiring teaching ideas that you can apply in your classroom
    • Our Story
    • Frequently Asked Questions
    • Testimonials
    • Contact Us
  • Pricing
  • School Access
    • Your school or district can sign up for Lesson Planet — with no cost to teachers
      Learn More
  • Sign In
  • Try It Free

Hi, what do you want to do?

Create a lesson plan
Create a lesson plan
Generate resources with 80+ AI teacher tools
Generate resources with 80+ AI teacher tools
Search 200,000 instructional videos
Search 200,000 instructional videos
Find a teaching resource
Find a teaching resource
Special Right Triangles and Right Triangle Trigonometry Lesson PlanSpecial Right Triangles and Right Triangle Trigonometry Lesson Plan
Publisher
Odell Education
Resource Details
Curator Rating
Educator Rating
Not yet Rated
Grade
9th - 11th
Subjects
Math
1 more...
Resource Types
Lesson Plans
3 more...
Audience
For Teacher Use
Duration
1 hr
Instructional Strategies
Collaborative Learning
1 more...
Year
2011
Usage Permissions
Fine Print
Lesson Plan

Special Right Triangles and Right Triangle Trigonometry

Curated and Reviewed by Lesson Planet
This Special Right Triangles and Right Triangle Trigonometry lesson plan also includes:
  • Special Right Triangles and Right Triangle Trigonometry (.doc)
  • Join to access all included materials

Right triangles are so special! Use special right triangles to discover the trigonometric ratios. Pairs construct special right triangles and find the values of the ratios of the sides. In the process, they discover the ratios stay the same based on the angle size. Individuals learn the definitions of the trigonometry ratios based on their investigations.

120 Views 75 Downloads
CCSS: Adaptable

Concepts

right triangles, special right triangles, trigonometric ratios, trigonometry applications, cosine, tangent, sine

Additional Tags

math

Instructional Ideas

  • For the special right triangles, calculate the ratios using exact values
  • Compare calculated trigonometric values with the values found in a trigonometry table

Classroom Considerations

  • The class should be well versed with the Pythagorean Theorem

Pros

  • Contains suggestions for differentiation
  • Includes extensions activities

Cons

  • None

Common Core

HSG-SRT.C.6 HSG-SRT.C.8 MP3 MP6 MP8

See similar resources:

Unit Plan

Right Triangle Applications: Lessons 1 and 2

Radford University
Use right triangles for more than just mathematical problems. The first two lessons of a unit ask pupils determine distances between cities by using the Pythagorean Theorem and a map. To cement understanding, learners use trigonometric...
9th - 12th Math
CCSS: Adaptable
Instructional Video

Special Right Triangle 45-45-90: Lesson

CK-12 Foundation
Square roots connect squares and right triangles. Using the Pythagorean Theorem, the video shows the relationship between the sides and hypotenuse of a 45-45 right triangle. The portion of a larger geometry playlist applies the...
4 mins 8th - 11th Math
Instructional Video

Special Right Triangle 30-60-90: Lesson

CK-12 Foundation
It is special—given one length, you can find the other two. A segment of a basic geometry playlist provides the ratio of the lengths of sides of a 30-60 right triangle. The presentation shows how to use the ratio to find side lengths...
3 mins 8th - 11th Math
Instructional Video

How Do You Find the Sine of an Angle in a Right Triangle?

Curated OER
A trigonometric ratio is a ratio between two sides of a right triangle. In this problem, find sin(A) in the given right triangle. Use the ratio of the opposite side over the hypotenuse.
3 mins 7th - 11th Math
Instructional Video

How Do You Find a Missing Side of a Right Triangle Using Cosine?

Curated OER
Trigonometry? What's trigonometry. Well, something to do with triangles, right? Right! Right triangles! In this problem, find the missing length of one of the sides. So set this up as a ratio: cosine(A) = adjacent side length divided by...
5 mins 6th - 11th Math
Interactive

Pythagorean Theorem for Solving Right Triangles: Solving the Triangle

CK-12 Foundation
Observe the change in the trigonometric ratios as angles vary. An interactive provides the values of trigonometric ratios for both acute angles in a right triangle. Pupils create a right triangle to match given criteria and find the...
9th - 12th Math
CCSS: Adaptable
Instructional Video

How Do You Find the Cosine of an Angle in a Right Triangle?

Curated OER
What's a trigonometric ratio? It is a ratio between two sides of a right triangle. In this problem, find cosine(A) in the given right triangle. Use the ratio of the adjacent side divided by the hypotenuse to find cos(A). The instructor...
3 mins 7th - 11th Math
Interactive

Lengths of Sides in Isosceles Right Triangles: Paper Football

CK-12 Foundation
Fuse sports and geometry by having your class create paper footballs—that are actually isosceles right triangles! Scholars use an interactive to create an isosceles right triangle to model a paper football. From the information in the...
9th - 12th Math
CCSS: Designed
Interactive

Relationships of Sides in 30-60-90 Right Triangles: Truck on a Mountain Road

CK-12 Foundation
Determine the change in elevation on a mountain road. Individuals use the interactive to simulate a truck driving up a mountain road with a 30-degree incline. They determine missing sides of a 30-60 right triangle to find horizontal and...
9th - 12th Math
CCSS: Designed
Instructional Video

How Do You Find the Tangent of an Angle in a Right Triangle?

Curated OER
What's a trigonometric ratio? It is a ratio between two sides of a right triangle. In this problem, find tangent(A) in the given right triangle. Use the ratio of the opposite side divided by the adjacent side to find tan(A). The...
3 mins 6th - 11th Math
Try It Free
© 1999-2026 Learning Explorer, Inc.
Teacher Lesson Plans, Worksheets and Resources

Sign up for the Lesson Planet Monthly Newsletter

Open Educational Resources (OER)

  • Health
  • Language Arts
  • Languages
  • Math
  • Physical Education
  • Science
  • Social Studies
  • Special Education
  • Visual and Performing Arts
View All Lesson Plans

Discover Resources

  • Our Review Process
  • How it Works
  • How to Search
  • Create a Collection

Manage Curriculum

  • Edit a Collection
  • Assign to Students
  • Manage My Content
Contact Us Site Map Privacy Policy Terms of Use