Circle Trig

sin (π/2)

• √3/2
• √2/2
• 1/2
• 1

cos (π/4)

• √3/2
• √2/2
• 1/2
• 1

cos(30^o)

• - ½
• √3/2
• 2√3 /3
• ½

cosθ is positive in

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

sinθ is positive in

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

Which diagram shows ^3π/₄ ?

• 
• 
• 
• 

What is the radius of the unit circle?

• 0
• 1
• 1/2
• √2/2

Tags

CCSS.HSF.TF.A.2

What is the circumference of the unit circle?

• 1

• π

• 2π

• 360°

What is the positive angle equivalent to -90° (this means find a positive coterminal angle)

• 90°

• 180°

• 270°

• There is no equivalent

What quadrant is -135° in? (use your unit circle to help you)

• 1

• 2

• 3

• 4