Evaluating with the Unit Circle

Based on your unit circle cos(0^o)=

• 1
• 0
• -1
• 1/2

sin(5π/3)=

• 1/2
• -√3/2
• √3/2
• -1/2

sin(7π/4)

• 1/2
• -√2/2
• √2/2
• -1/2

sin(3π/2)

• 0
• 1
• -1
• 1/2

What is half a circle in radians?

• π/4
• π
• 2π
• π/2

cos 5π/6

• -1/2
• 1/2
• √3/2
• -√3/2

sinθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants

If sin A < 0 and  cos A < 0, then what quadrant is A in?

• I
• II
• III
• IV

sin 7π/6

• 1/2

• -1/2

• √3/2

• -√3/2

• 0

• none of the answer choices