I WILL GIVE 30 POINTS TO THOSE WHO FILL IN THE BLANKS CORRECTLY NOOOO SCAMS

Answer:
864 in^2
Step-by-step explanation:
Area of triangle
15 x 18 x 1/2 = 135
Area of Square
18 x 18 = 324
There are 4 triangles so...
135 x 4 = 540
Therefore the area is
540 + 324 = 864