INTRO TO RADIANS

Important formula:

c = 2πr

Notes:

• π radians in half a circle 
  • π  radians = 180 degrees

EX)

• πθ  = 180
  ----      ------
  π           π 

CONVERTING RADIANS TO DEGREES

• Multiply # of radians by 180/π 

DEGREES TO RADIANS

π radians/180 = 1 degree

• multiply # of degrees by π radians/180 to figure out the number of radians