Each step of a stairway rises 18 cm for a tread width of 32 cm. What angle does the stairway make with the floor?

Answer:
29.4°
Step-by-step explanation:
The ratio of rise to run is the tangent of the angle, so the angle is ...
angle = arctan(rise/run) = arctan(18/32)
angle ≈ 29.4°