Okay just learn this formula and you will be able to solve all the questions you posted about these by yourself :)
Area of triangle= [tex]\frac{1}{2}absinC[/tex] I explained this in the prevoius answer I answered just refer to the attachment if you have trouble in figuring out what is a what is b and was is C, So basically we need an angle in between to line with the lengths, in our case here C is 110, a is 9 and b is 15 just pop those values in the formula and voila you got the area of the triangle :)
[tex]\frac{1}{2}(9)(15)(sin(110))[/tex]
[tex]\frac{1}{2}(135)(0.94)[/tex]
[tex]=63.43[/tex]
Hope this helps you :) and if you need anymore help, just let me know :)
