Final answer:
The area of rectangle ABCD is 24 square units.
Step-by-step explanation:
The area of a rectangle can be found by multiplying the length of one side by the length of an adjacent side. In this case, the length of AB is 4 units (6 - 2) and the length of AD is also 6 units (8 - 2). Therefore, the area of rectangle ABCD is 4 units x 6 units = 24 square units.