Question 1005075
A drawing or labeled figure should be necessary.  Here is a system through which three variables can be found and solved:


{{{system((1/2)by=50,AB*sin(25)=y,sin(100)/(AB)=sin(25)/b)}}};
Variable y is the height of the triangle using AC=b as the base, and the third last equation is use of Law Of Sines.  


The analysis of the drawing (not shown here) can give the system; and then this system can be solved, and you can include finding b=AC.  This is the base of the triangle.  That is the strategy.  I have not finished doing the solution but you should be able to.