Radian is the measure of an angle whose vertex is the centre of the circumference and it makes an arc with the same length as the radius
π rad = 180o


  Exercise: change the radians into degrees or viceversa:

  a) 34o 15' 17''

  b) 135o

  c) 3π/2

  d) 5π/3


  Solutions:  a) 0,597 rad; b) 3π/4 rad; c) 270o; d) 300o

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