Algebra 2: Resources and Extra Practice - 9.01 Introduction to the Unit Circle

Algebra 2: Resources and Extra Practice

9.01 Introduction to the Unit Circle

Essential Question:

How can the radian measure of an angle determine the arc length on the unit circle?
How can the unit circle be used to apply trigonometric functions to all real numbers?

Lesson 9.01 Video - If video does not load correctly, Click Here to watch the video.

Khan Academy Resources

Intro to radiansSal explains the definition and motivation for radians and the relationship between radians and degrees.

Radians & degreesSal discusses the general approach to converting between radians and degrees and vice versa.

Degrees to radiansSal converts the degree measures 150° and -45° to radians.

Arc length from subtended angle: radiansSal finds the length of an arc using the radius and the radian measure of the angle subtended by the arc.

Angles, arc lengths, and trig functions — Basic exampleWatch Sal work through a basic Angles, arc lengths, and trig functions problem.

Unit circleLearn how to use the unit circle to define sine, cosine, and tangent for all real numbers.

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