Ratios of Trigonometric Functions

What is the radius of the unit circle?

• 0
• 1
• 1/2
• √2/2

At what point are sine and cosine the same value?

• 0
• 90
• 45
• 60

What are the 3 basic trigonometric functions?

• Sine, cosine, and cotangent

• Sine, cotangent, and cosecant

• Sine, cosine, and tangent

• Cosecant, cosine, and cotangent

sinθ is positive in

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

cosθ is positive in

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

tanθ 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 is not the pair of angle $\theta$  and its corresponding reference angle,  $\alpha$  

•  $\theta=206\degree\ ,\ \alpha=26\degree$  

•  $\theta=337\degree,\ \alpha=23\degree$  

•  $\theta=112\degree,\ \alpha=68\degree$  

•  $\theta=195\degree,\ \alpha=75\degree$  

The diagram below shows a unit circle. State the possible values of a and b.

• $a=0.9397,\ b=0.3420$

• $a=0.9397,\ b=-0.3420$

• $a=-0.9397,\ b=0.3420$

• $\alpha=-0.9397,\ b=-0.3420$

What is the value of sine at 330°?

• 1/2

• -1/2

• √3 / 2

• -√3 / 2

What is the value of sine at 150°?

• 0

• 1/2

• 1

• √3 / 2