Exploring Coterminal and Reference Angles on the Unit Circle

What is added to an angle measure in degrees to find a positive co-terminal angle?

• 270 degrees

• 90 degrees

• 180 degrees

• 360 degrees

If an angle is given in radians, what is subtracted to find a negative co-terminal angle?

• 3 Pi radians

• 1/2 Pi radians

• 2 Pi radians

• Pi radians

In which quadrant is an angle of 225 degrees located?

• First quadrant

• Fourth quadrant

• Second quadrant

• Third quadrant

What is the reference angle for an angle located in the second quadrant?

• 180 degrees minus Theta

• 360 degrees minus Theta

• Theta minus 90 degrees

• Theta minus 180 degrees

How is the reference angle calculated in the fourth quadrant?

• Theta minus 360 degrees

• 180 degrees minus Theta

• Theta minus 180 degrees

• 360 degrees minus Theta

What is the cosine of an angle Theta equal to Pi/6 on the unit circle?

• sqrt(2)/2

• sqrt(3)/2

• 1/2

• 2/3

What is the sine of 270 degrees on the unit circle?

• 1

• 0

• -1

• 1/2

What happens to the tangent of 270 degrees?

• It equals 0

• It equals -1

• It equals 1

• It is undefined

What is the secant of 270 degrees?

• 0

• Undefined

• -1

• 1

What is the cotangent of 270 degrees?

• Undefined

• 0

• 1

• -1