# Trigonometric Identities Teacher Resources

Find Trigonometric Identities lesson plans and worksheets
Showing 25 - 48 of 942 resources
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#### Trigonometric Ratios

For Students 11th
In this trigonometric ratios worksheet, 11th graders solve and complete 15 different types of problems. First, they use the unit circle to sketch the line through an angle with a given measure. Then, students find the coordinates of a...
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#### Basic Trigonometric Ratios

For Teachers 11th - 12th
In this trigonometric ratio worksheet, students determine the length of a side of a right triangle, or the measurement of angles using trigonometric ratios. This one-page worksheet contains 24 problems. Answers are provided at the bottom...
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#### Proof of Identity

For Teachers 9th - 12th Standards
Students explore trigonometric identities.   In this Algebra II lesson, students use graphing to verify the reciprocal identities.  Using Cabri Jr, students investigate the Pythagorean trigonometric identities and the geometric c proofs...
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#### Does Your Field Measure Up

For Teachers 9th - 11th
Young scholars measure angles using a plane table kit. In this geometry lesson, students use trigonometric identities to find the values of the length of a football field.
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#### Finding Trigonometric Ratios

For Students 11th
In this finding trigonometric ratios instructional activity, 11th graders solve and complete 22 various types of problems. First, they find the value of each trigonometric ratio to the nearest ten-thousandth. Then, students use a...
6:09
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#### Trigonometric Ratios: Sine

For Students 10th - 12th Standards
What happens when you don't have enough information to use the Pythagorean Theorem? Time for some trig! The second lesson in a series of four introduces the definition of sine, teaches how to find the sine ratio of a right triangle, and...
5:38
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#### Chain Rule for Derivatives, with Trig Functions

For Students 11th - Higher Ed
Break the chain in finding derivatives of trigonometric functions. The short video provides a demonstration of finding the derivative of a trigonometric function where the argument is a function. The 12th video in a series of 31 focuses...
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#### Differentiation Quiz

For Teachers 11th - 12th
In this differentiation quiz worksheet, students solve 10 short answer problems. Students differentiate rational equations, trig functions, exponential models, higher order polynomials, etc.
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#### Trigonometric Ratios

For Students 10th - 12th
In this trigonometric ratios worksheet, students determine the value of trigonometric ratios.  They find the area of triangles, determine the length of one side, and compute the degrees in an angle.  This five-page worksheet contains 55...
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#### "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.
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#### Trigonometric Function

For Students 11th
For this trigonometric functions worksheet, 11th graders solve and complete 6 various types of problems. First, they express each of the expressions in trigonometric form. Then, students use DeMoivre's Theorem to express each of the...
1 In 1 Collection 9:17
Lesson Planet

#### Intro to the Trigonometric Ratios

For Students 11th - Higher Ed
This video introduces the basics of trigonometry. It starts by defining a right triangle and showing two different examples of finding the ratios of sine, cosine, and tangent using the SOH-CAH-TOA mnemonic. This resource could be used as...
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#### Exploring Trigonometric Ratios

For Teachers 9th - 10th
Students identify the ratios of trig functions. In this trigonometry lesson, students construct triangles and use it to derive the values of sine, cosine and tangent. They use Cabri software to create the visual of the identities.
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#### Inverse Trig Functions: Domain and Range

For Students 9th - Higher Ed
For this trigonometric functions worksheet, students calculate the domain and range of the three basic trig functions. There are 6 equations.
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#### Trigonometric Ratios and the Pythagorean Theorem

For Students 9th - 12th Standards
Take an alternative route with trigonometry and let learners connect a tweaked version of the pythagorean theorem to the original in terms of triangle sides. The assignment leads participants towards deriving the Pythagorean identity...
4:37
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#### 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...
2:22
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.
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#### The Cosine Ratio

For Students 9th - 12th Standards
Help your classes understand the relationship between trigonometric ratios and similarity. A set of questions ask scholars to consider the ratio of sides of similar figures. They conclude that all similar triangles must have the same...
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#### Trig Card Game (Review of Trig Identities)

For Students 9th - 11th
For this trig card game, learners play a card game to form and identify trigonometric identities.  Students collect cards to form identities.  This one-page worksheet contains instructions for making cards and the rules of the game. ...
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#### Special Values of Trig Functions

For Students 9th - 11th
In this trig functions learning exercise, students complete a chart to find the special values of trig functions. This one-page learning exercise contains 58 problems.
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#### Section 5.2 Worksheet: Trig Functions

For Students 10th - Higher Ed
In this trig function worksheet, students find the values of six trig functions for the given angle. They determine the exact values of the legs of right triangles. Students use the Pythagorean identities to write expressions as an...
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#### Practice B: Trigonometric Ratios

For Students 9th - 10th
In this trigonometric ratios worksheet, students use trigonometric ratios to determine the length of one side of a triangle or the angle measurement of right triangles. They draw vectors in a coordinate plane. This three-page worksheet...
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#### Trig Ratios

For Teachers 9th - 10th Standards
Students derive the six trigonometric ratios. In this trigonometry activity, students use trigonometric properties to find the missing angles of triangles.
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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...