Vertical part of a step in a staircase?

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Multiple Choice

Vertical part of a step in a staircase?

Explanation:
The vertical part of a step is called the riser. In stairs, each step has a horizontal surface called the tread and a vertical face called the riser, which creates the rise between treads. The riser is the visible vertical portion you step up against. The other terms don’t fit: a stairway angle describes the overall incline, a protractor is a measuring tool for angles, and a straight edge is used to draw or check straight lines. So the vertical face between two treads is the riser.

The vertical part of a step is called the riser. In stairs, each step has a horizontal surface called the tread and a vertical face called the riser, which creates the rise between treads. The riser is the visible vertical portion you step up against. The other terms don’t fit: a stairway angle describes the overall incline, a protractor is a measuring tool for angles, and a straight edge is used to draw or check straight lines. So the vertical face between two treads is the riser.

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