Question 674343
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how do I find the area of an {{{highlight(cross(iscoseles))}}} <U>isosceles</U> triangle when I've only been given 
the measurements of two sides using the sine rule: 1/2(ab)sinC.
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First, &nbsp;the formula works for any triangle, &nbsp;not necessary isosceles.



Second, &nbsp;you ask &nbsp;" How do I find . . . " - the answer is: &nbsp;simply substitute the given/known values into the formula,

exactly as using any other formula.  &nbsp;By the way, &nbsp;in addition to the sides &nbsp;'a' &nbsp;and &nbsp;'b', 

the measure of the angle &nbsp;'C' &nbsp;between these side is assumed to be given, or known, or derived from other data in the problem.



&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If nothing more than the sides &nbsp;'a' &nbsp;and &nbsp;'b' &nbsp;is given, &nbsp;you will not be able to find the area of this triangle.


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Then your formula and the problem itself &nbsp;" has no enough fuel " &nbsp;to deliver you to your destination.


 
Third, &nbsp;the &nbsp;" sine rule " &nbsp;is irrelevant to this formula.



Summarizing, &nbsp;I would say that this request is formulated in a confused manner, 
its purpose is hidden in the fog and is not clearly visible.