Refine Your Results

Now... gain access to over 2 Million curated educational videos and 500,000 educator reviews to free & open educational resources

Get a 10 Day Free Trial

38 resources with the concept special right triangles

Videos (Over 2 Million Educational Videos Available)
Phonics Song 2 (new version) Video
2:54
Phonics Song 2 (new version)
Who was Frederick Douglass? Video
3:07
Who was Frederick Douglass?
The Secret World of Animal Sleep 101 Sleepless on the Savanna Video
3:42
The Secret World of Animal Sleep 101...
Other Resource Types (38)
+
12 Items in Course
Lesson Planet: Curated OER

Flipped Math: Geometry

For Students 9th - 12th Standards
Imagine taking a complete geometry course remotely! Eleven units make up the My Geometry course. Each unit follows the Flipped-Mastery cycle of learning, divided into two semesters. Pupils watch and take notes on a video that details the...
+
29 Items in Unit
Lesson Planet: Curated OER

Geometry Unit 9: Area of Polygons

For Teachers 9th - 12th Standards
Six lessons make up the Geometry Unit 9: Area of Polygons unit module. Pupils review the formulas for finding the area of parallelograms and triangles. They apply previous learning of trigonometric ratios and the Pythagorean Theorem to...
+
30 Items in Unit
Lesson Planet: Curated OER

Geometry Unit 7: Right Triangles

For Students 9th - 12th Standards
Six lessons comprise the Geometry Unit 7: Right Triangles unit module. In the first lesson, pupils review the Pythagorean Theorem and determine how to use the converse to determine whether a triangle is right, obtuse, or acute. Next,...
+
17 Items in Unit
Lesson Planet: Curated OER

Common Core Algebra 2, Unit 9

For Teachers 9th - 12th Standards
Flip your classroom, or offer engaging visual aids to your lessons with a series of videos that explore the concept of trigonometry. After an introduction to the topic, high schoolers investigate reference triangles, unit circles, and...
+
Lesson Plan
Lesson Planet: Curated OER

Been Caught Stealing

For Teachers 6th - 8th Standards
You're safe, when calculating the odds of stealing second base! Learners compare the rate of a runner to the distance the ball travels, in a activity that explores right triangles and measurement. Full of discussion questions and fun...
+
Handout
2
In 2 Collections
Lesson Planet: Curated OER

Trigonometry Review Sheet

For Students 9th - 12th Standards
Get the trig facts fast, and use the review sheet as a guide in the classroom. The worksheet also includes a document version if any changes are needed to the problems. The information includes a small degree/radian chart, a graph of all...
+
Handout
2
In 2 Collections
Lesson Planet: Curated OER

Trig Cheat Sheet

For Teachers 10th - 12th Standards
Your pre-calculus learners will make use of this wonderful cheat sheet that summarizes all things trigonometric. Definitions based on both the unit circle and the right triangle are included, as well as many convenient trigonometric...
+
Instructional Video16:02
2
In 2 Collections
Lesson Planet: Curated OER

Unit 9 Review: Area of Polygons

For Students 9th - 12th Standards
It's time to show what you know! Individuals first review finding the area of polygons using the formulas from parallelograms to regular polygons. They then brush up on finding the area and circumference of circles, as well as reviewing...
+
Instructional Video20:13
2
In 2 Collections
Lesson Planet: Curated OER

Regular Polygons

For Students 9th - 12th
Make area a regular affair. By dividing a regular polygon into triangles, pupils see how the area formula works. Learners watch several examples of finding the area of various regular polygons before practicing how to find the area of...
+
Instructional Video7:06
2
In 2 Collections
Lesson Planet: Curated OER

Unit 7 Review: Right Triangles

For Students 9th - 12th Standards
It is all right to spend some time with a review. After watching a short review video covering the materials from the unit, pupils work through 23 review problems. Scholars work on problems involving the Pythagorean Theorem and its...
+
Instructional Video10:02
2
In 2 Collections
Lesson Planet: Curated OER

Special Right Triangles II

For Students 9th - 12th
Show students that right triangles are radical. Learners see how the lengths of the sides of a 45-45-90 triangle relate. Using that relationship, pupils observe how to find any of the lengths given one side of a triangle. They go on to...
+
Instructional Video20:13
2
In 2 Collections
Lesson Planet: Curated OER

Special Right Triangles I

For Students 9th - 12th
Introduce a special relationship with right triangles. Learners discover the ratio of the sides in a 30-60-90 triangle. After watching several examples and seeing two different methods, pupils find unknown sides in triangles. Scholars...
+
Worksheet
2
In 2 Collections
Lesson Planet: Curated OER

Unit 9 Review: Trigonometric Functions

For Students 9th - 12th Standards
Terminate a review into a unit circle. Pupils work through 20 items to review the beginning introduction to trigonometric functions, starting with solving right triangles by finding lengths of sides and reference angles and terminal...
+
Instructional Video25:49
2
In 2 Collections
Lesson Planet: Curated OER

Unit Circle and Radians

For Students 9th - 12th Standards
Measure angles is easy as pi. Pupils review special right triangles to find exact values for trigonometric functions. Scholars learn about radians and how they connect to measurements in degrees. They find exact and approximate values of...
+
Performance
Lesson Planet: Curated OER

Football Tackle Problem

For Teachers 9th - 12th Standards
Tackle a task on the gridiron. Scholars use geometric concepts to determine the distance on a coordinate plane that certain football players need to move for a play. They then design their own plays and create presentations where they...
+
Unit Plan
Lesson Planet: Curated OER

Right Triangle Applications: Lessons 1 and 2

For Students 9th - 12th Standards
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...
+
Unit Plan
Lesson Planet: Curated OER

Right Triangle Sports

For Teachers 9th - 12th Standards
Who knew math could help with sports? An invigorating set of lessons encourages learners to apply right triangles in baseball, volleyball, hockey, football, and soccer. They use the Pythagorean Theorem, Pythagorean triples, special right...
+
Unit Plan
Lesson Planet: Curated OER

Module 7: Modeling with Geometry

For Teachers 9th - 12th Standards
Model good modeling practices. Young mathematicians first learn about cross sections and solids of revolution. They then turn their attention to special right triangles and to the Laws of Sine and Cosine.
+
Activity
Lesson Planet: Curated OER

Catcher to 2nd

For Students 9th - 12th Standards
Who's on second? Young mathematicians use a diagram of a baseball field to find the distance a catcher must throw to reach second base. A brief video of such a play during a baseball game sets the stage for the assignment.
+
Instructional Video3:02
Lesson Planet: Curated OER

Special Right Triangle 30-60-90: Lesson

For Students 8th - 11th
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...
+
Instructional Video3:45
Lesson Planet: Curated OER

Special Right Triangle 45-45-90: Lesson

For Students 8th - 11th
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...
+
Lesson Plan
Lesson Planet: Curated OER

Unit Circle: Special Angles—Just Know One

For Students 9th - 12th Standards
It's all about the patterns! Young scholars learn that the unit circle repeats itself in all four quadrants. Using these patterns, they evaluate the sine, cosine, and tangent of special angles.
+
Lesson Plan
Lesson Planet: Curated OER

"I Saw the Sine"

For Teachers 9th - 12th Standards
Discover trigonometric ratios that complement each other. Using two videos, the lesson introduces the trigonometric ratios. The class discovers the relationship between the sine and cosine of complementary angles.
+
Interactive
Lesson Planet: Curated OER

Unit Circle: Medieval Castle Defense

For Students 10th - 12th Standards
Who needs a plan — let trigonometry protect you! Pupils determine the angle of an approaching enemy to a village wall. The scholars determine the exact value of trigonometric functions for the angle. Class members use trigonometry to...