Evaluating trig for angles in the unit circle

The unit circle...

• Has center at (1,1)
• Has a circumference of 1
• Has a diameter of 1
• Has a radius of 1

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

• 1
• sqt2/2
• sqt3/2
• 1/2

What the coordinates of 180° on the unit circle?

• 0, 1
• 1, 0
• -1, 0
• 0, -1

4π/3 is equal to how many degrees?

• 60°
• 240°
• 300°
• 120°

π/4=?

• 45°
• 210°
• 150°
• 135°

5π/6=?

• 135°
• 150°
• 330°
• 315°

What quadrant does 21π/4 lie in?

• Quadrant 1
• Quadrant 2
• Quadrant 3
• Quadrant 4

sin π/4

• √2∕2
• 1/2
• √3/2
• 0

tan 7π/4

• -1
• 1
• √2/2
• undefined

cos(30^o)

• - ½
• √3/2
• 2√3 /3
• ½