n order to meet ADA (Americans with Disabilities Act) requirements, a wheelchair ramp must have an angle of elevation of no more than 4.8. A builder needs to install a ramp to reach a door that is 2.5 feet off the ground. Is 20 feet long enough for the straight line distance of the ramp to meet the requirements? What angle of elevation will this ramp have? A 20-foot ramp, will have an angle of elevation of approximately