Question 1172701
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If two sides of a triangle are given as  " a"  and  " b"  with the angle  {{{gamma}}}  between them,


then there is a STANDARD FORMULA for the area of the triangle


   area = {{{(1/2)*a*b*sin(gamma)}}}.


M E M O R I Z E  it  and  use it every time in this situation.


There is NO NEED to derive it every time anew - it is a STANDARD FORMULA for everyday use, which people know and use for thousands years.
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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.



Do not miss other lessons on this subject &nbsp;(the area of a triangle) &nbsp;that you find in the links at the end of that lesson.