Tangent value of stair angle = step height ÷ step width {also = (total step of stairs+1) × step width ÷ step height × total step}

Tangent of building slope = total height of stair section ÷ total length of stair section.

It should be noted that the number of pedals in the plan is one less than the number of kicking surfaces, and one pedal should be added. The top pedal is connected with the rest platform. )