Question

According to ADA guidelines, at most, an incline can be 8.5°. Is the following incline acceptable? If yes, prove it. If not, explain why and change one dimension in the design so that it would be.​

Answer 1

Let the angle is x.

We have:

• tan x = 15/90
• tan x = 1/6
• x = arctan (1/6)
• x ≈ 9.5°

Since 9.5° > 8.5° it is not acceptable.

If the angle is 8.5° and the height is x, then we have:

• tan 8.5° = x / 90
• x = 90 tan 8.5°
• x = 13.45 ft

The height is at most 13.45 ft