C.0.45
D.6.68
HELPPPP 16 POINTSSSS

The answer is 400in^2

work :

you can separate this figure into two regular figures: a parallelogram and a right triangle

let's find the area of the parallelogram
(height x side)


and now we can find the area of the right triangle (height x side /2



so the area of the whole shape is :


good luck