Joshua Psalms T. answered  02/29/16
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            Civil EIT, Former College Professor of Mathematics (in Asia)
A = (1/2)*(side1)*(side2)*sin(included angle)
     
        Joshua Psalms T.
tutor
                    maybe your calculator is in radian
                
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            02/29/16
 
     
             
                     
                     
                    
Anan S.
02/29/16