Reference Angles and Radian Measure

How many degrees does  circle have?

• 360 degrees
• 2pi
• 180 degrees
• pi

How many radians does a circle have?

•   360 degrees
• 2pi radians
• pi radians
• ^{2 radians}

When the rotation from initial to terminal side is counterclockwise this describes. 

• Positive Angle
• Negative Angle

Which of the following is closest to the measure of the angle shown?

• 7/10 π
• 3/8 π
• 7/20 π
• 3/2 π

Which of the following is closest to the measure of the angle drawn by the green curve?

• 5/6 π
• 5/3 π
• 4/5 π
• 4/3 π

Which quadrant is -5π/6 in?

• I
• II
• III
• IV

Which quadrant is 2π/3 in?

• I
• II
• III
• IV

In what quadrant is 285°

• I
• II
• III
• IV

What is the co-terminal angle of 210⁰ ?

• -30⁰
• -150⁰
• -40⁰
• 150⁰

What is the co-terminal angle of -80⁰ ?

• -10⁰
• -280⁰
• 10⁰
• 280⁰