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Math Help - Sector Angle

  1. #1
    Member GAdams's Avatar
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    Sector Angle

    Sector of a circle:
    Perimeter 115.1 cm
    radius 25.4 cm

    Calculate the angle:

    I get 259, but the answer says 145.

    I used this formula:

    Sector Perimieter = theta/ 360 * 2*pi*r

    Help!
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  2. #2
    MHF Contributor

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    You want the arc length.
    But you are given the perimeter of the sector.
    That includes the radius twice; substract 2r.
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