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Radians & arc length

The figure shows a circle with a radius of 3 units. A central angle of 'theta' radians subtends an arc of 15 units.
In the circle shown above, what is the measure of θ\theta in radians?
  • Your answer should be
  • an integer, like 66
  • a proper fraction, like 1/21/2 or 6/106/10
  • a simplified proper fraction, like 3/53/5
  • an improper fraction, like 10/710/7 or 14/814/8
  • a simplified improper fraction, like 7/47/4
  • an exact decimal, like 0.750.75
radians
In the diagram, θ\theta is a central angle.