Sin Cos and Tan on Unit Circle Radians

What is cos 60°?

• ½

• ^√3/₂

• ^√2/₂

• 1

What is sin 45°?

• 1
• ^√3/₂
• ½
• ^√2/₂

What is cos 90°?

• ½

• undefined

• 1

• 0

What is sin 30°?

• ^√3/₂

• 1

• ½

• ^√2/₂

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

• y/r

• x/r

• r/y

• y/x

Answer explanation

The sin is always the y coordinate divided by the radius. With the unit circle that radius is 1.

In the unit circle, the cosine of an angle would be...

• The y-value of the point on the circle

• The x-value of the point on the circle

• y/x using the point on the circle

• None of the above

• 1
• 2
• 3
• 4

• undefined

Answer explanation

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

• Sin

• y coordinate

• Tan

• x coordinate

• Cot

• Cos

Based on your unit circle cos(30^o)=

• 1

• 1/2

• sqt3/2

• sqt2/2