The physical disabled people has a problem in our towns and cities. Some of them use a wheelchair, so they can´t go up stairs. To solve this problem, ramps are built for disabled people. These ramps have to accomplish a legislation that specifies the width and inclination angle (or slope) of the ramp.
One spanish team of Sanchez Cantón High School had studied the width and inclination angle of several ramps of a zone of their citie (Pontevedra). To check if the ramp accomplish the legislation, they had to solve a problem: how to measure the inclination angle of a ramp?