Sin Cos and Tan on Unit Circle

sin π/4

• √2∕2

• 1/2

• √3/2

• 0

tan 7π/4

• -1

• 1

• √2/2

• undefined

sin 7π/6

• 1/2

• -1/2

• √3/2

• -√3/2

sin 2π/3

• 1/2

• -1/2

• √3/2

• -√3/2

Match the trig function with it value on the unit circle:

• Sin

• Tan

• x coordinate

• Cot

• y coordinate

• Cos

• undefined

Answer explanation

sinθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

• 1
• 2
• 3
• 4

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

• y/r

• x/r

• r/y

• y/x

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

• y

• x

• x/y

• y/x