Answer:
1728 in²
Explanation:
For the area of B, you need to find the length and width (height and base, whatever you want to call it).
For the height, you would need to do: 144 - 36 - 24 - 36 = 48 inches
For the base, you would need to do: 60 - 24 = 36 inches
Now you multiply the base and height to get the area: 48 x 36 = 1728 in²