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520 resources with the concept trigonometric ratios

Lesson Planet

"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.
Lesson Planet

How Tall Am I?

For Teachers 9th - 11th Standards
Which method results in a better estimate of the height? Using  different methods, groups estimate the height of three objects on campus. They record their measurements and any necessary computations and compare them to the actual...
Lesson Planet

Exact Trigonometric Ratios: Triangles to the Unit Circle

For Teachers 9th - 12th Standards
Special right triangles give special information. Individuals learn how to find trigonometric ratios in all quadrants. This involves using special right triangles and the Pythagorean Theorem.
Lesson Planet

Washington Monument

For Students 9th - 12th Standards
Look up, up, up to the top. Using their knowledge of trigonometric ratios, pupils determine the angle of elevation in a real-world situation. Learners calculate the angle of elevation from the base of the flags around the Washington...
Lesson Planet

The Sine of 57

For Students 9th - 12th Standards
What does the sine of every 57-degree angle have in common? A series of questions helps build the understanding of similarity in relation to the sine ratio. Ultimately, scholars realize that all 57-degree angles have the same sine value.
Lesson Planet

Step Up

For Students 9th - 12th Standards
Rise up to the challenge of solving problems with stair steps. Given a diagram of the riser, tread, and stringer of a set of stairs, learners solve two problems of interest. These problems involve trigonometry and angle relationships.
Lesson Planet

Discovering Trigonometric Ratios

For Teachers 9th - 12th Standards
Are there equivalent ratios in right triangles? The discovery lesson plan has the class find the ratios of sides of right triangles with equivalent angle measurements. Using these ratios, pupils discover that particular ones are the...
Lesson Planet

Right Triangle Relationships

For Students 9th - 12th Standards
Work with sine and cosine relationships three ways. Three questions assess pupils' understanding of the trigonometric relationship between complementary angles. Learners use the value of one ratio to determine the other and the equal...
Lesson Planet

Sine and Cosine

For Students 9th - 12th Standards
What is the complementary relationship between sine and cosine? Using a right triangle, pupils explain why the sine of one acute angle is equal to the cosine of the other. The triangle measurements are given as variables.
Lesson Planet

River Width

For Students 9th - 12th Standards
Just how wide of a river runs through it? The assessment provides a scenario of finding the distance across a river. Given two markers on one side of the river and the angles formed by them and an object on the other side of the river,...
Lesson Planet

Are You Pulling My Trig?

For Teachers 9th - 12th Standards
Introduces the three main trigonometric ratios to your class. Pupils use a calculator to determine the sine, cosine, and tangent of given angles and side ratios. They continue on to use the ratios to solve problems.
3:05
Lesson Planet

Introduction to SOHCAHTOA

For Students 9th - 12th Standards
Explore right triangle trigonometry with a thorough video lesson. The lesson instructor introduces the trigonometric ratios with an examination of right triangle sides and angles. She continues with practice writing the ratios using...
2:57
Lesson Planet

Area of a Triangle 1/2absinC

For Students 9th - 12th Standards
Can you find the area of a triangle without knowing the height? Applying trigonometry makes quick work of this type of problem. The video instructor presents problems for scholars to consider and then provides a worked out solution. She...
2:35
Lesson Planet

SOHCAHTOA - Finding Missing Sides Part 2

For Students 9th - 12th Standards
Explore some right triangle trigonometry with a straightforward video lesson. The instructor presents problems requiring scholars to use trig ratios to find unknown side measures. She provides worked-out solutions for those needing...
3:22
Lesson Planet

SOHCAHTOA - Finding Missing Angles

For Students 9th - 12th Standards
Apply the trig ratios to find unknown angle measures. Learners review the side and angle relationships in right triangles and then apply the ratios to find the angle measures. The video shows several worked-out examples applying all...
3:57
Lesson Planet

Exact Trig Values - Easy Table

For Students 9th - 12th Standards
Having trouble remembering the trig ratios of common angles? This resource may be the solution! Using a table, the video instructor describes a memorable pattern. Scholars have an opportunity to practice the pattern during the video.
4:38
Lesson Planet

SOHCAHTOA - Finding Missing Sides Part 1

For Students 9th - 12th Standards
Explore the meaning and application of the three trigonometric ratios. A thorough video reviews the trig ratios and then shows how to apply them in triangle problems. The instructor demonstrates several examples finding both side and...
4:08
Lesson Planet

Exact Trig Values - Hand Trick

For Students 9th - 12th Standards
Having trouble remembering the trigonometric ratios of the common angles? Here's a video for you! The lesson instructor demonstrates a hand trick that helps individuals determine the correct trigonometric ratios. The trick works for...
Lesson Planet

Decoding Basic Trigonometric Ratios

For Students 9th - 12th Standards
Demonstrate the calculator keystrokes necessary for finding a measure of an angle using trigonometry. A straight forward lesson explains how to calculate an angle measure given a sine, cosine, or tangent ratio. The narrator discusses...
Lesson Planet

Perilous Plunge

For Students 9th - 12th Standards
Determine the length of the drop in the flume. Pupils determine the distance a rider travels on one of the highest and steepest water rides. Given the height and the angle of elevation, scholars determine the length of the hypotenuse of...
Lesson Planet

Patterns in the 30-60-90 Table

For Students 9th - 12th Standards
Sine and cosine ratios have more in common than just their names—they are complementary to each other. Using a 30-60-90 triangle, pupils create a table of the sine and cosine of the acute angles. The learners describe the relationships...
Lesson Planet

Intro to Trigonometric Ratios

For Students 9th - 12th Standards
Finding trigonometric ratios is relatively easy; you just have to know where to look. The first installment of a 16-part video playlist shows how to find the sine, cosine, and tangent values for a given angle. It shows how to find the...
Lesson Planet

Introduction to SOHCAHTOA

For Students 9th - 12th Standards
You might not be able to pronounce it, but everyone remembers SOHCAHTOA. Young mathematicians learn a way to remember the three major trigonometric ratios. They see how the first letters of certain words lead to the mnemonic. 
Lesson Planet

Lighthouse Keeper

For Students 9th - 12th Standards
Shine a light on the distance between two boats. The short assessment provides the angle of depression from a lighthouse to two boats. The learners represent the situation with a diagram and calculate the distance between the two boats.