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    • Thread Starter
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    I don't know where to start with this. Any hints as to what formulas I should be thinking about?

    The arc AB of a circle, centre O and radius rcm, is such that angle AOB = 0.5 radians. Given that the perimeter of the minor sector AOB is 30cm:

    a) Calculate the value of r.


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    so perimeter would be 30= r+r + arc length arc length= r x feta
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    (Original post by SophieL1996)
    so perimeter would be 30= r+r + arc length arc length= r x feta
    I think you mean theta. . .
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    Ok fair enough any ideas for this question? ^^^
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    (Original post by SophieL1996)
    Ok fair enough any ideas for this question? ^^^
    Your idea is the correct method
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    Use the perimeter formula and re-arrange to make r the subject.
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    PS Reviewer
    It's a matter of rearranging when dealing with these questions.

    Use all the information give to you.
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    (Original post by JodieW)
    I don't know where to start with this. Any hints as to what formulas I should be thinking about?

    The arc AB of a circle, centre O and radius rcm, is such that angle AOB = 0.5 radians. Given that the perimeter of the minor sector AOB is 30cm:

    a) Calculate the value of r.

    Posted from TSR Mobile
    (Original post by SophieL1996)
    so perimeter would be 30= r+r + arc length arc length= r x feta
    Use SophieL's method, add up all the bits and solve the equation you get for r
    • Thread Starter
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    I still don't know how to figure it out. It seems like I have too little information. Please any more tips?

    EDIT: figured it out, it was staring at me in the face and I missed it. Thanks guys!


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