How do i solve this without a calc;

$\displaystyle Area=\frac{1}{2}\times\sqrt2\times\sqrt2\times(\fr ac{\sqrt2}{2})$

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- Oct 13th 2008, 06:18 PMFlexibleQuick question
How do i solve this without a calc;

$\displaystyle Area=\frac{1}{2}\times\sqrt2\times\sqrt2\times(\fr ac{\sqrt2}{2})$ - Oct 13th 2008, 06:52 PMFlexible
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:

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

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

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

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

$\displaystyle Area=\frac{1}{2}\times5\sqrt3\times{10}\times(-\frac{\sqrt3}{2})$ - Oct 14th 2008, 02:21 AMFlexible
anyone?