To find an area of a triangle with SAS information, we can use the following:
[tex]A = \frac{absin(c)}{2} [/tex] where a and b are the two sides, and c is the included angle.
[tex]A = \frac{(40)(25)sin(80)}{2} [/tex]
[tex]A = \frac{984.807753}{2} [/tex]
[tex]A = 492. 4 m^{2} [/tex] rounded to the nearest tenth