Evaluating Trig Functions on the Unit Circle

What is the sine of 5 PI over 6?

• 1/3

• 3/4

• 2/3

• 1/2

What is the reference angle used to find the sine of 5 PI over 6?

• 30 degrees

• 45 degrees

• 60 degrees

• 90 degrees

Which angle is equivalent to 5 PI over 6 in degrees?

• 150 degrees

• 135 degrees

• 180 degrees

• 90 degrees

What is the y-coordinate of the point where the angle 5 PI over 6 intersects the unit circle?

• 1/2

• -1/2

• 0

• 1

What type of triangle is used to evaluate the cosine of -7 PI over 4?

• 45-45-90 triangle

• 30-60-90 triangle

• Equilateral triangle

• Isosceles triangle

What is the cosine of -7 PI over 4?

• 0

• sqrt(2)/2

• 1/2

• sqrt(3)/2

How is the cosine of -7 PI over 4 calculated using the unit circle?

• Adjacent side divided by the hypotenuse

• Opposite side divided by the hypotenuse

• Opposite side divided by the adjacent side

• Using Pythagorean theorem

What is the tangent of 600 degrees?

• sqrt(3)

• 1

• -1

• 0

What is the result of dividing by zero in the context of the tangent of PI over 2?

• 0

• Undefined

• Infinity

• 1

What special right triangle is used to evaluate the tangent of 600 degrees?

• 30-60-90 triangle

• 45-45-90 triangle

• Isosceles right triangle

• Equilateral triangle