Design of Staircases
A _________ is a sloping surface and it is adopted as a substitute for stair for easy connection between the floors.
In ________ all steps lead in one direction only.
A Stair turning through one right angle is known as a _______ stair.
A Stair turning through two right angles is known as a _________ stair.
The vertical portion between each tread on the stair is called: