Respuesta :
The shelf must be at right angles (90 degrees) relative to the wall.
Step-by-step explanation:
Dana concern is that the shelf must be perpendicular to the wall. This means that the angle between the wall and the Dana’s shelf must be 90 degrees.
The term “perpendicular” is sometimes used in the mathematical terminology for the angle of 90 degrees. Hence, the Dana’s shelf must be at 90 degrees relative to the wall. It is to be noted here that straight lines make an angle of 180 degrees. Since the shelf is at 90 degrees, either side of the shelf would be at 90 degrees to the wall.
The shelf should be 90 degrees relative to the wall.
Perpendicular lines are described as two lines that meet or intersect each
other at right angles (90°) . This simply means the lines form a 90 degree
angle.
Dana is attaching a shelf to the wall and she needs the shelf to be
perpendicular to the wall.
Therefore, for the shelf to be perpendicular to the wall, the angle of the shelf
relative to the wall should be 90 degrees.
learn more about perpendicular lines here: https://brainly.com/question/15537663?referrer=searchResults
