Question 1205186
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The diagonals of a parallelogram are 6cm and 8cm long and they intersect 
at an angle of 55°. Calculate the area of the parallogram.
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<pre>
In this parallelogram, the diagonals divide/separate it in 4 (four) triangles.


Two of these 4 triangles are congruent and have the sides 3= 6/2 meters and 4= 8/2 meters
with the concluded angle of 55°.


Two other of these 4 triangles are congruent and have the sides 3= 6/2 meters and 4= 8/2 meters
with the concluded angle of 180° - 55° = 125°.


Therefore, the area of this parallelogram is


    {{{2*(1/2)*3*4*sin(55^o) + 2*(1/2)*3*4*sin(125^o)}}} = 3*4*0.81915204428 + 3*4*0.81915204428 = 19.65964906 (rounded).  <U>ANSWER</U>
</pre>

Solved.