Answer is C
Find the area of the triangle to get 72cm^2. There are two triangles so times 72 by 2 to get 144
Find the area of the first side by doing 12 x 30 = 360cm^2
Find the area of the second side by doing 9 x 30 = 270cm^2
Find the area of the base by doing 18 x 30 = 540cm^2
Add 144+360+270+540 = 1314cm^2