We can find the surface area in 3 easy steps: 1. Find the area of the top and bottom rectangles. 2 Find the lateral area by finding the perimeter multiply by the height. 3. Add Item 1 and 2 together.
Step 1: Find the area of the top and bottom rectangles: Area = 2 x (18 x 6) = 216 in²
Step 2: Find the lateral area: Area = (18 + 18 + 6 + 6) x 9 = 432 in²
Step 3: Add them together: Total Area = 216 + 432 = 648 in²
