Answer:
D. 531[tex]in^{2}[/tex]
Step-by-step explanation:
I suppose these are rectangles and not triangles.
Area of Rectangle = Length x Breadth
Area of Large Rectangle = 21 x 18
= 378[tex]in^{2}[/tex]
Area of Small Rectangle = 17 x 9
= 153[tex]in^{2}[/tex]
Total Area = Area of Large Rectangle + Area of Small Rectangle
= 378 + 153
= 531[tex]in^{2}[/tex]
