Radian measure and arc length

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Examples
Lessons
  1. Use the information in each diagram to determine the value of the variable
    Give your answers to the nearest hundredth of a unit.


    1. Using arc length and radius to calculate angle in radian

    2. using angle in radian to calculate arc length of a circle

    3. Using angle in radian and arc length to calculate radius

    4. Using angle in degree and radius to calculate arc length
  2. A 20 cm long pendulum swings through an arc length of 60 cm. Through
    what angle, in both degrees and radians, does the pendulum swing?
    Topic Notes
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    arc  length=rθ  radian arc\;length= r \cdot \theta\;radian