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Math Help - Quick question

  1. #1
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    Quick question

    How do i solve this without a calc;

    Area=\frac{1}{2}\times\sqrt2\times\sqrt2\times(\fr  ac{\sqrt2}{2})
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  2. #2
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    Oct 2008
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    I'm having a problem when i can't cancel the -2 and the cosB, for example;

    From the cosine rule to find the area of a triangle:

    -2\times(x+1)\times(x-2)\times{Cos120}

    -2\times(x+1)\times(x-2)\times-\frac{1}{2}

    Here i can just cancel the -2 and  -\frac{1}{2} as -2 \times 1 \times -\frac{1}{2} = 1

    The problem arises when i cant cancel these two components so what do i do? For example;

    Area=\frac{1}{2}\times5\sqrt3\times{10}\times(-\frac{\sqrt3}{2})
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  3. #3
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    anyone?
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