A ladder 12 m long with its foot on the street rests against the wall of a house on one side of the street 10 m high. By moving the ladder about its foot, it can reach the wall of the house on the opposite side of the street, but 3 m back of the street line, at a point 6 m high. Find the width of the street. A. 13 m B. 15 m

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Stair construction and layout

Stair is a type of vertical transportation in a building which consist of a series of steps in a flight of stairs that enable the vertical movement of people and materials from one floor to another. A staircase consists of steps that comprises of riser & tread, handrail, baluster, stair stringers, newel post and waist slab. The construction of staircase with all the components is termed as stair construction. A staircase is an enclosure that contains the entire stairway. The materials used for the construction of stairs are bricks, reinforced cement concrete, stone, lumber, steel and a combination of these materials.