Stairway

What angle rising stairway if step height in 20 cm and width 26 cm?

Correct result:

A =  37.6 °

Solution:

y=20 cm x=26 cm  s=yx=2026=1013≐0.7692 α=arctan⁡(s)=arctan⁡(0.7692)≐0.6557 rad A=α→∘=α⋅ 180π∘=0.6557⋅ 180π∘=37.6∘=37∘34′7"

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