Intro to Unit Circle

Which of the following can be found on the unit circle? Check all that apply.

• coordinates

• area

• angle measures

• side lengths of triangles

Which special right triangle can be used to derive the coordinates for the pi/4s in the unit circle?

• 30-60-90

• 45-45-90

Which special right triangle can be used to derive the coordinates for the pi/3s and pi/6s on the unit circle?

• 30-60-90

• 45-45-90

What is the radius of the unit circle?

• 1

• 5

• 10

• It depends

Which point is the center of the unit circle?

• (0,0)

• (1,1)

• (0,1)

• (1,0)

Match the correct radian measure for letters a (30 degrees), b (45 degrees), and c (60 degrees) - what matching best completes Quadrant I of the Unit Circle with these Radian Measures?

• a

• 
• b

• 
• c

• 

Which coordinate relates to the cosine of an angle?

• x-coordinate

• y-coordinate

• neither

Which coordinate relates to the sine of an angle?

• x-coordinate

• y-coordinate

• neither

What is sin 45°?

• 1

• ^√3/₂

• ½

• ^√2/₂

What is cos 60°?

• ½

• ^√3/₂

• ^√2/₂

• 1