Answer:
[tex]\Large \boxed{\sf 322.5 \ in^2}[/tex]
Step-by-step explanation:
Find the area of the 4 triangles and add them.
Area of triangle = base × height × 0.5
[tex](10 \times 15 \times 0.5 \times 3)+(15 \times 13 \times 0.5)= 322.5[/tex]
