The Unit Circle and Quadrants

What is the value of cosine at 270

• 0

• 1

• -1

What is the value of cosine at 315

• 0

• 1

• √2 / 2

• -√2 /2

tanθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

Based on the unit circle, what is the value of sin?

• y

• x

• x/y

• y/x

Based on the unit circle, what is the value of cos?

• y

• x

• x/y

• y/x

Based on the unit circle, what is the value of tan?

• y/r

• x/r

• r/y

• y/x

Find sin(-240°)

• (√3)/2)

• (-1/2)

• (√2/2)

• (1/2)

Q1. What is the value of sin(30°)?

• A) -√3/2

• B) -½

• C) -√2/2

• D) -1

• ½
• √2/2
• √3/2
• 1

cos(60°)

• 0

• 1/2

• √3/2

• 1