Question

Dana is attaching a shelf to a wall and needs the shelf to be parallel to the floor. How many degrees should the shelf be

Answer 1

Answer:  0 degrees (choice A)

Explanation:

By definition, the floor is assumed to be level and that means the floor is at a 0 degree angle. The shelf must also have this same angle relative to the floor so we have the shelf and floor as parallel planes. For more info, check out the converse of the corresponding angles theorem.