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A horizontal member of stair is known as:
○ a. Rise
O b. Tread
○ c. Step
O d. Riser

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Final answer:

The vertical distance between steps in a staircase is called the rise, while the horizontal member you step on is known as the tread.


Explanation:

Rise is a term used to define the vertical distance between steps of a staircase. In a staircase, the rise corresponds to the height of each step. The horizontal member of a stair is known as the tread, which is the flat surface that you step on.


Learn more about Stairs and stair components here:

https://brainly.com/question/43173797


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