Evaluating Trig by Unit Circle

• ½
• √2/2
• √3/2
• 1

cos 4π/3

• -√3/2

• √3/2

• 1/2

• -1/2

sin π/4

• √2∕2

• 1/2

• √3/2

• 0

sin 2π/3

• 1/2

• -1/2

• √3/2

• -√3/2

What is the value of sine at 210?

• 1/2

• -1/2

• √3 / 2

• -√3 / 2

At what point are sine and cosine the same value?

• 0

• 90

• 45

• 60

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

cosθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

Which of the following degree measures is represented by this diagram?

Which of the following degree measures is represented by this diagram?