Right Triangles Teacher Resources

Find Right Triangles lesson plans and worksheets
Showing 1 - 24 of 1,299 resources
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Getting into Trig

For Teachers 9th - 12th Standards
Starting with right triangles (SOH-CAH-TOA) and working up to the concept of radians, this collection introduces students to trigonometric ratios and supports them in learning to evaluate trigonometric functions.
35 Items in Collection
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Common Core Math: 8th Grade

For Teachers 8th Standards
Check out the Common Core with a collection that represents all the 8th grade math standards. Most resources engage multiple standards but the main one is listed on the notes section of each tab. 
11 Items in Collection
Lesson Planet

Pythagorean Theorem: Not All Sides are Equal

For Teachers 9th - 12th Standards
You'll find fundamentals and advanced activities focused on the Pythagorean Theorem in this collection, which was designed for high schoolers but helpful for young geometrists of all ages!
40 Items in Collection
Lesson Planet

Common Core Math: 6th Grade

For Teachers 6th Standards
Need some help aligning your 6th grade math curriculum to Common Core? Here is a collection complete with a resource for every standard in the curriculum. While many of these resources cover multiple math standards, the main one...
3 Items in Collection
Lesson Planet

"Grade 9-12, Claim 2 & 4: Problem Solving & Communication Reasoning Supports"

For Teachers 9th - 12th Standards
Small but mighty, a collection of three resources features presentation slides that prepare high schoolers for the Smarter Balanced assessment. Claim 2 features problem solving questions drawn from all content areas. Claim 3 focuses on...
10 Items in Collection
Lesson Planet

Grade 8, Claim 1: Concepts and Procedures Item Slide Shows

For Teachers 8th Standards
Ten resources make up a collection of student and teacher-friendly slides that prepare eighth graders for the Smarter Balance assessment. Learners review rational and irrational numbers, convert repeating decimals to fractions, as well...
1 In 1 Collection 4:00
Lesson Planet

Find the Area of a Right Triangle

For Students 5th - 7th Standards
Help your class develop a greater understanding of the area of a right triangle. The video starts by reviewing the area of a rectangle and noting that the rectangle is made up of two congruent triangles. Learners are then shown that in...
2:49
Lesson Planet

How Do You Determine if a Triangle Is a Right Triangle if You Know its Sides?

For Teachers 6th - 10th
Use the Pythagorean Theorem formula to check if this given triangle, with the given lengths of each side, is a right triangle. It's as simple as plugging the given values into the formula and doing the math to see if the solution checks...
3:44
Lesson Planet

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...
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Pythagorean Theorem for Solving Right Triangles: Solving the Triangle

For Students 9th - 12th Standards
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...
Lesson Planet

Special Right Triangles and Right Triangle Trigonometry

For Teachers 9th - 11th Standards
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...
Lesson Planet

Perimeter and Area of a Right Triangle

For Students 9th - 12th Standards
Make sure the coordinates are right when calculating distances. Given a right triangle on the coordinate plane, pupils determine the perimeter and the area. The scholars calculate the length of each side using the coordinates of the...
Lesson Planet

Lengths of Sides in Isosceles Right Triangles: Paper Football

For Students 9th - 12th Standards
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...
Lesson Planet

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

For Students 9th - 12th Standards
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...
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Special Right Triangles

For Teachers 9th - 12th Standards
Using the Pythagorean Theorem to solve for missing angles, students evaluate right triangles and their properties.
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Ratios of Right Triangles

For Teachers 9th - 12th
Students find the angle measures of a right triangle given two side lengths.  In this finding the angle measures of a right triangle given two side lengths instructional activity, students record the ratio of a leg and hypotenuse of a...
Lesson Planet

Investigating Segments in a Right Triangle

For Teachers 9th - 12th Standards
High schoolers explore the concept of right triangles as they construct a right triangle using Cabri Jr. Learners find the midpoint of the hypotenuse and construct a line from the midpoint to the vertex of the right angle. They then...
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Ratios in Right Triangles

For Teachers 9th - 12th Standards
Learners calculate the sides of right triangles in this trigonometric ratios lesson. They use Cabri Jr. software and TI-83 or TI-84 calculators to find the side lengths and their ratios to each other for various triangles. The provided...
Lesson Planet

Sin, Cos, and Tan of Right Triangles

For Teachers 9th - 12th
Students explore the sine, cosine, and tangent relationships of a right triangle.  In this sine, cosine, and tangent relationships of a right triangle lesson, students construct a right triangle.  Students develop the sine, cosine, and...
Lesson Planet

30-60-90 Right Triangles in Cabri Jr.

For Teachers 9th - 12th Standards
Young mathematicians draw and label right triangles using Cabri Jr. technology. They create other special right triangles and identify the length of the hypotenuse and each leg. Students explore the ratios to determine how the hypotenuse...
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Basic Right Triangles

For Teachers 2nd - 4th
Elementary schoolers examine the attributes of triangles. In this triangle lesson, learners compare regular triangles and right triangles. They explore vertices and angles and investigate obtuse and acute angles. Pupils draw multiple...
EngageNY

Special Relationships Within Right Triangles—Dividing into Two Similar Sub-Triangles

For Students 9th - 10th Standards
Why are right triangles so special? Pupils begin their study of right triangles by examining similar right triangles. Verifying through proofs, scholars recognize the three similar right triangles formed by drawing the altitude. Once...
1 In 1 Collection
EngageNY

The Area of Right Triangles

For Teachers 6th Standards
Slice and dice area. Pupils cut rectangles in half and determine the area of the resulting right triangles. They use what they discovered to develop a formula to find the area of a right triangle in the second lesson in a 22-part series.
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Interior Designers: Working with Right Triangles

For Teachers 7th - 8th Standards
Adding a career application, the resource explores the idea of making squares from the sides of a right triangle to show that the sums are equal. The question refers to designing a mural that leads the class into their own drawing of a...