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Math Help - Areas of a sector

  1. #1
    Senior Member Mukilab's Avatar
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    Areas of a sector

    Please note if I am incorrect

    Question: There is a sector of a circle with centrepoint O. The radius of this circle is 23cm. The angle of the sector is 165 degrees. Work out the area of the sector correct to two significant figures.

    I did (\frac{\pi *23^2}{180})*165

    From which I got (thinking about the significant figs) 1500.
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  2. #2
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    Hello, Mukilab!


    Your answer is twice the correct answer.

    Area of a sector: . A \:=\:{\color{red}\tfrac{1}{2}}r^2\theta

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  3. #3
    Senior Member Mukilab's Avatar
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    theta? What does that mean? I don't understand it outside of trigonometry.

    Also what do you mean by twice the correct answer?
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  4. #4
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    theta is the angle in radians
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