Question

Dana is attaching a shelf to a wall and needs the shelf to be perpendicular to the wall. How many degrees should the shelf be relative to the wall?

Answer 1

The shelf should be perpendicular to the wall, forming a 90-degree angle.

Step-by-step explanation:

The shelf should be perpendicular to the wall, which means it should form a 90-degree angle with the wall. In other words, the shelf should be horizontal when it is attached to the wall. This can be achieved by using a level to ensure that the shelf is perfectly aligned with the horizontal axis of the wall.

For example, if Dana is using a standard carpenter's level and places it on top of the shelf, she should adjust the position of the shelf until the bubble in the level is centered between the two lines, indicating that the shelf is perfectly horizontal.

Answer 2

90°

Step-by-step explanation:

The shelf will be perpendicular to the wall if it intersects the wall at a right angle which is equal to 90°