$\"\"$

\

Consider the area of triangle with sides of $\"\"$ and $\"\"$

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The angle is $\"\"$ .

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Therefore the area of triangle is , $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore, the area of triangle is $\"\"$ .

\

$\"\"$

\

Consider the area of triangle with sides of $\"\"$ and $\"\"$ .

\

The angle is $\"\"$ .

\

Therefore the area of triangle is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Therefore, the area of triangle is $\"\"$ .

\

The total area of triangle is $\"\"$ .

\

The total area of triangle is $\"\"$ .

\

$\"\"$

\

The total area of triangle is $\"\"$ .