Unit circle

What is the value of sine at 210°?

• 1/2

• -1/2

• √3 / 2

• -√3 / 2

sin π/4

• √2∕2
• 1/2
• √3/2
• 0

cos 5π/6

• -1/2
• 1/2
• √3/2
• -√3/2

sin 7π/6

• 1/2
• -1/2
• √3/2
• -√3/2

cos 4π/3

• -√3/2
• √3/2
• 1/2
• -1/2

What are the exact coordinates of 3π/4 on the unit circle?

• (−√2∕2, √2∕2)

• (−√2∕2, −√2∕2)

• (−√3∕2, −√2∕2)

• (√2∕2, −√2∕2)

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

• 1
• 0
• -1
• 1/2

sin(π/6)

• 1/2
• √2/2
• √3/2
• 2

What is sin π/4?

• √2∕2
• 1/2
• √3/2
• 0

What is the exact value of sin 150°

• -1/2
• -√3/2
• 1/2
• √3/2