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

What is a Radian?

• another name for pi

• a real number measurement

• a degree

• a what?

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

Find the reference angle.

• -15°

• 15°

• -165°

• 165°

What is 360 degrees in radians? 

• 2π/3

• 5π/4

• 2π

• π

What is the reference angle?

• 163

• 73

• 27

• 107

Find the reference angle.

What is the reference angle?

• 112

• 68

• 158

• 248

What is the reference angle?

• 43

• -43

• 47

• -47

Convert 270^o into radians

• π/ 4

• 3π/ 2

• 3π/ 4

• π/ 2