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Khan Academy

Khan Academy: Radians and Degrees

For Students 9th - 10th Standards
Convert angle measures given in degrees to radians and vice versa. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Handout
Math Open Reference

Math Open Reference: Radians

For Students 9th - 10th
Learn about radians with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhance further explanation. Includes links to related topics.
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Khan Academy

Khan Academy: Radians & Arc Length

For Students 9th - 10th Standards
Solve problems related to radians and arc length like finding an arc length given the central angle and radius.
Activity
Interactive Mathematics

Interactive Mathematics: Radians

For Students 9th - 10th
Learn the definition of radians and how to calculate trig ratios using radian measures. Examples are provided showing how to convert from degrees to radians.
Activity
Interactive Mathematics

Interactive Mathematics: Applications of Radian Measure

For Students 9th - 10th Standards
After demonstrating how to find arc length and sector area using radian measures, student can practice the concepts with the examples provided and play an interactive game involving angular velocity.
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Savvas Learning

Pearson Education: Radian and Degree Angle Measures [Pdf]

For Students 9th - 10th Standards
This resource details how to convert between radians and degrees with worked examples. It also looks at special radian measures that are used often.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf.1 What Exactly Is a Radian?

For Teachers 9th - 10th Standards
For this task, students use a piece of string or another tool to measure the radius of the circle and then mark off the corresponding arc length on the unit circle as many times as they need to for 0, 1, 2, 3, 4, 5, and 6 radians. They...
Unit Plan
Oswego City School District

Regents Exam Prep Center: Arc Length and Radian Measure

For Students 9th - 10th Standards
The mathematics session investigates arc length and radian measure. The tutorial consists of class notes, calculator tips, examples, and practice problems with solutions. The teacher resource includes an activity that discovers radian...
Graphic
Northeast Parallel Architectures Center, Syracuse University

Npac Reu Program: Radians

For Students 9th - 10th Standards
Northeast Parallel Architectures Center of Syracuse University offers a quick overview of radian measurement of angles. Also includes an example.
Unknown Type
Khan Academy

Khan Academy: Radians & Degrees

For Students 9th - 10th Standards
Convert angle measures given in degrees to radians and vice versa.
Activity
Interactive Mathematics

Interactive Mathematics: Angles Degrees and Radians

For Students 9th - 10th Standards
Angles are key to Trigonometry. Learn definitions of the parts of an angle, degrees, and radians, identify the standard position of an angle, convert between radians and degrees, and more.
Lesson Plan
Khan Academy

Khan: Lesson 16: Part 2 Coordinate Geometry; Trigo and Radians; Complex Numbers

For Teachers 9th - 10th Standards
2 OF 2 FOR ADDITIONAL TOPICS IN MATH. Students will use the coordinate plane and equations of lines and circles to describe figures; create the equation of a circle given the figure or use the structure of a given equation to determine a...
Handout
Other

Teachers Choice: How to Convert Degrees to Radians or Radians to Degrees

For Students 9th - 10th Standards
This site offers a discussion on radian measure. The site offers pictures and explanations to clarify the formulas given. (Note: The free download at the end of the page will not work in archived version of site.)
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Bicycle Wheel

For Teachers 9th - 10th Standards
The purpose of this task is to introduce radian measure for angles in a situation where it arises naturally, in this case the movement of a bicycle wheel. Aligns with HSF-TF.A.1.
Handout
Windstream

Ojk's Precalculus Study Page: Measurement of Angles

For Students 9th - 10th Standards
An introduction to radian measurement, including converting between radians and degrees. Includes several examples and lots of pictures.
Interactive
University of Colorado

University of Colorado: Ph Et Interactive Simulations: Trig Tour

For Students 9th - 10th Standards
Take a tour of trigonometry using degrees or radians! Look for patterns in the values and on the graph when you change the value of theta. Compare the graphs of sine, cosine, and tangent.
Graphic
Math2

Math2.org: Trigonometry Tables

For Students 9th - 10th Standards
Three trig tables are provided for student and teacher reference. The first table lists the sine, cosine, tangent, secant, cosecant, and cotangent values of all whole-number angles from 0 to 90. The radian equivalent (to four decimals)...
Handout
Northeast Parallel Architectures Center, Syracuse University

Npac Reu Program: Conversion

For Students 9th - 10th
This site displays the formulas for the simple conversions of degrees to radians and radians to degrees. Near the bottom of the page there are examples of these conversions.
Activity
Lawrence Hall of Science

The Math Page: Trigonometry: Arc Length

For Students 9th - 10th Standards
Here is a site that clearly and thoroughly explains arc length and its relationship to radian measure of angles. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this site...
Unit Plan
University of Saskatchewan (Canada)

Exercises in Math Readiness for University Study: Trig

For Students 9th - 10th Standards
Read a lesson, look at examples, and try easy, medium, and advanced problems from a variety of trigonometry topics: radian measure of angles, trigonometric functions, trigonometric identities, and modeling with trigonometric functions.
Activity
Other

Randelshofer / Online Scientific Calculator

For Students 9th - 10th
This is an online scientific calculator! Just type as if you were using a handheld calculator. Includes trigonometric functions, degrees, radian modes and other useful functions.
Activity
Other

Brown Math: A 10 Minute Trig Review

For Students 9th - 10th Standards
Looking for a 10-minute review of the major concepts of trigonometry? This site is a quick recap of degrees and radians, SOH CAH TOA, Pythagorean identities, and special right triangles are all found here.
Article
Physics Aviary

Physics Aviary: Quick Circular Motion Calculations Challenge

For Students 9th - 10th
This challenge is designed to help students move back and forth from different circular motion ideas. These ideas include frequency, rpm, period, angular speed, linear speed, total distance and total radians.
Handout
Other

Dans Math: Lessons: Trigonometry

For Students 9th - 10th
College professor Dan Bach reviews basic trig concepts, including trig functions, right triangles, circles, radians, and polar coordinates. Site includes animated graphs and detailed examples.

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