Degrees/Radians, Co-Terminal and Reference Angles

What are co-terminal angles?

• angles that share the same terminal side

• angles that are supplementary

• angles that are complimentary

• angles that are opposite each other

How do you convert from degrees to radians?

• multiply by the factor
  π/180

• multiply by the factor 180/
  π

• use your calculator

• ask siri

What is a reference angle?

• angles measuring more than 180 degrees

• co-terminal with another angle

• an angle measured in degrees

• Acute, positive angle formed with terminal side and x axis

What is a Radian?

• another name for pi

• a real number measurement

• a degree

• a what?

Find the reference angle.

• -65°

• 125°

• -55°

• 55°

Which is a coterminal angle to the angle shown?

• 42

• 138

• 582

• 492

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

Find the reference angle.

• -15°

• 15°

• -165°

• 165°

Find the reference angle.

Find the reference angle.