Angles and Unit Circle

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

• √2/2

• 1/2

• 1

• √3/2

The hypotenuse of any right triangle from the center of the unit circle to an edge is always

• 1

• √2/2

• √3/2

• 1/2

What is half a circle in radians?

• π/4

• π

• 2π

• π/2

What is the exact value of cos 330°

• -1/2

• -√3/2

• 1/2

• √3/2

What is the exact value of cos 135°

• √2/2

• -√2/2

• √3/2

• -√3/2

4π/3 is equal to how many degrees?

• 60°

• 240°

• 300°

• 120°

π/2 is equal to how many degrees?

• 180°

• 90°

• 135°

• 240°

cot 4π/3

• √3/3

• √3/2

• -√3/2

• -1/2

What is the angle measure, in degrees, at the red marking on the unit circle?

• 30°

• 45°

• 60°

• 90°

What is the reference angle for 275°?

• 85°

• 95°

• -85°

• -95°