First you have to find the areas of the two parts, for the herbs its 135ft to get that you need to look at the large 18ft on the left side, and the 9 feet on the right side, 18-9=9 and then multiply by the 15 on the top. 9x15=135 for the vegetables you multiply 9 by 24 9x24= 216 add the 135 to get 351
