Exploring the Unit Circle and Circular Functions

What is the initial side of an angle called?

• Terminal side

• Initial side

• Rotational side

• Fixed side

What is the relationship between the sine function and the coordinates in the unit circle?

• Sine equals y/x

• Sine equals x/y

• Sine equals x-coordinate

• Sine equals y-coordinate

In the unit circle, what does the radius equal?

• 0

• 1

• 2

• Pi

What is the cosine of an angle in the unit circle defined as?

• x/y

• x-coordinate

• y/x

• y-coordinate

What happens to the trigonometric functions when the radius (R) is 1?

• They simplify

• They do not change

• They become undefined

• They become complex

How is the tangent of an angle calculated in the unit circle?

• sine/cosine

• cosine/sine

• 1/cosine

• 1/sine

Where does the tangent function not exist?

• At every pi

• At every pi/2

• At every 2pi

• At every 3pi/2

What is the cosine of 3 pi/2 in the unit circle?

• 1

• 0

• -1

• Undefined

What is the reference angle for an angle in quadrant 4?

• Pi plus the angle

• Pi minus the angle

• 2 pi plus the angle

• 2 pi minus the angle

What quadrant is the angle pi over 4 located in?

• Quadrant 3

• Quadrant 4

• Quadrant 1

• Quadrant 2