High School Math : Understanding Angles in the Unit Circle

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : Understanding Angles In The Unit Circle

In the unit circle, what is the angle in radians that corresponds to the point (0, -1)?

Possible Answers:

Correct answer:

Explanation:

On the unit circle, (0,-1) is the point that falls between the third and fourth quadrant.  This corresponds to .

Example Question #21 : Graphs And Inverses Of Trigonometric Functions

What is the reference angle for ?

Possible Answers:

Correct answer:

Explanation:

To find the reference angle, subtract  (1 trip around the unit circle) from the given angle until you reach an angle which is less than .  

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