Vaughn is laying sod in his backyard. A diagram of his backyard is below.


Note: Figure not drawn to scale

If a = 22 ft, b = 31 ft, and c = 37 ft, what is the area of the backyard?
A.
914.5 ft2
B.
90 ft2
C.
1,147 ft2
D.
25,234 ft2