Question 1121733
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You can solve it in much more easy way.



<pre>
In this problem, two side lengths of the triangle are given and the angle concluded between these two sides.


Then the area of the triangle is equal to 


    A = {{{(1/2)*b*c*sin(A)}}} = {{{(1/2)*15*22*(sqrt(2)/2)}}} = 116.67 cm^2.
</pre>

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On formulas for the area of a triangle see the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Surface-area/Formulas-for-area-of-a-triangle.lesson>Formulas for area of a triangle</A>, 

in this site.