Trig

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 is half a circle in radians?

• π/4
• π
• 2π
• π/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°

7π/6=?

• 300°
• 30°
• 120°
• 210°

sinθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants

cosθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants