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The preferred angle for a stairway is 35 degrees because this angle provides a balance between safety, comfort, and usability. A stairway at this angle allows for a comfortable ascent and descent, minimizing the risk of falls while still being space-efficient.

When stairs are set at an angle of 35 degrees, the rise (the height of each step) and the run (the depth of each step) are proportioned in such a way that they create a manageable incline for most users, including those with mobility issues. This angle also meets many building codes and safety standards, making it a common practice in residential and commercial building design.

Other angles, although they may allow for different design aesthetics or space-saving measures, can compromise safety or comfort. For instance, angles steeper than 35 degrees might be challenging for elderly users or those carrying objects, while a gentler slope might require more horizontal space than is available in certain building layouts. The 35-degree standard is thus favored for its compromise between all these factors.