Have you worked with the law of sines and cosines? I will explain this using the law of sines.
Here is the formula for area: ¹⁄₂ • c • b • sin(A)
¹⁄₂ • 11 • 9 • sin63
¹⁄₂ • 99 • sin63
49.5 • sin63
49.5 • .8910065242...
≈44.1
That should be the area of the triangle. The other way to do this is to just start by using the law of cosines, and then finding the height of the triangle, and then using the area formula. I believe the way I showed you is the easier way though. Message me if you have any questions.
Also make sure to include units : 44.1cm²