+357 132 is 169
Each triangle is 7.5*16=120
120*4=480
480+169=649
Yay!
EDIT: did my math wrong lul, try the one either below or above mine
+36916 Each triangle is 7.5*16=120 <======= slight mistake here Varxaax 
We all have hiccups!
+36916 Base is 13 x 13 = 169 ft ^2
each of the triangles is 1/2 b h = 1/2 13 x 16 = 104 ft2 there is 4 of them 104 *4 = 416 ft2
416 + 169 = 585 ft2
