Answer:
756 in^2
Explanation:
first you would find the area of one of the triangle, the formula for that is h*b/2 and for this it would be 12*18/2 which would give you 108 and then multiply that by 4 because there are 4 triangles which gives you 432 then you need to find the base area and you would find the base if one triangle since they are all the same and get 18 then you do 18*18 because the equation for area on a square/rectangle is multiply the longer side by the shorter side but its a square so all the sides are even and get 324 then add that to the 432 and get 756